Online assessments have become an important part of recruitment for many IT, consulting and graduate roles. Instead of attending every stage at a physical location, candidates may be asked to complete aptitude tests, coding assessments, video interviews or remotely supervised assessments from home.
Platforms such as Mercer | Mettl, HireVue, AMCAT and CoCubes can be used in different ways depending on how an employer configures its recruitment process. A particular assessment may be proctored, non-proctored, video-based, skills-based or a combination of different formats. Mercer | Mettl, for example, supports both proctored and non-proctored assessments, while HireVue provides on-demand video interviewing and candidate practice resources.
The good news is that most online assessments become much easier when you separate preparation into two areas:
technical readiness and answer quality.
This guide explains how to prepare for both.
1. Start With the Assessment Invitation
Before doing anything else, read the invitation carefully.
Check:
Date and time of the assessment
Duration
Whether the test is live or on-demand
Whether video is required
Whether the assessment is proctored
Supported device
Browser requirements
Whether any secure browser or application must be installed
Whether identification or authentication is required
Candidate-support details
Do not rely on a generic internet article for the exact requirements of your test.
The instructions in your employer's assessment invitation take priority.
2. Complete the Technical Check Before Test Day
Technical problems can create unnecessary stress.
Complete the system check well before the assessment begins.
Check your:
Camera
Make sure your face is clearly visible and the camera works correctly.
Microphone
Record a short test and listen to the playback.
Internet connection
Make sure your connection is stable rather than relying on a last-minute mobile hotspot.
Browser
Use the browser version requested by the assessment provider.
Operating system
Install required updates before the assessment rather than immediately before it.
Mercer | Mettl's current candidate guidance recommends checking the system in advance and lists supported browsers and network requirements. Its proctored assessments can use webcam monitoring, while non-proctored assessments do not require the same monitoring setup.
3. Do Not Wait Until the Last Minute to Install Required Software
Some online assessments use a secure or lockdown environment.
Mercer | Mettl's Secure Browser, for example, can restrict leaving the test environment and can prevent access to unauthorized applications during an assessment.
Install anything required by the assessment invitation ahead of time.
Then perform the available system check or mock test.
Do not experiment with unfamiliar software five minutes before your actual assessment.
4. Prepare the Room, Not Just the Computer
Your physical environment matters during a video or proctored assessment.
Choose a quiet location with:
Good front-facing lighting
A stable desk
Minimal background movement
A clear camera view
Limited noise
No unnecessary people entering the frame
A light source positioned in front of you is generally better than sitting directly in front of a bright window.
Your face should be clearly visible without strong shadows.
Mercer | Mettl's guidance for proctored assessments specifically emphasizes a usable webcam environment and provides technical requirements for candidates.
5. Use a Laptop or Desktop When the Assessment Requires It
Do not assume that every online assessment works from a mobile phone.
The supported device depends on the assessment configuration.
For example, Mercer | Mettl's current documentation states that some proctored assessments require a laptop or desktop and that certain proctored configurations do not support mobile devices.
Always follow the device instructions in your specific assessment invitation.
6. Understand What an Automated Video Interview Is
An on-demand video interview is different from a traditional live interview.
You may see a question on screen, receive a limited preparation period and then record your response.
Some employers may configure practice questions before the real interview.
HireVue's candidate resources specifically recommend using practice questions to become familiar with the platform before proceeding with an actual on-demand interview.
Your objective is not to sound like a professional news presenter.
Your objective is to communicate clearly, naturally and directly.
7. Use STAR for Behavioral Questions
For experience-based questions, the STAR framework is a simple structure:
Situation — What was happening?
Task — What were you responsible for?
Action — What did you actually do?
Result — What happened as a result?
For example, if you are asked:
“Tell me about a time you solved a difficult problem.”
A weak answer might spend most of the time describing the problem.
A stronger answer explains your specific contribution and finishes with the result.
Example Structure
Situation: Our project was receiving repeated application errors.
Task: I was responsible for investigating the issue.
Action: I analyzed the logs, reproduced the problem and identified an incorrect input-handling condition.
Result: We fixed the issue and reduced the repeated failures in subsequent testing.
The example should always be based on something you genuinely experienced.
8. Keep Video Answers Focused
A long answer is not necessarily a better answer.
For many video questions, a response of roughly 60 to 90 seconds is a useful practice target, although the actual time limit should come from the employer or assessment platform.
A practical structure is:
Opening sentence → Main example → Your action → Result → One-line takeaway
Avoid:
Repeating the question
Long introductions
Unrelated stories
Excessive technical jargon
Memorized speeches
9. Look at the Camera
During a recorded video response, try to look toward the camera rather than constantly watching your own preview window.
This creates a more natural impression of eye contact.
Sit upright, keep your face reasonably centered and speak at a normal pace.
You do not need exaggerated facial expressions.
Natural communication is usually better than trying to “perform” for the camera.
10. Practice Without Memorizing
Practice five to ten common questions aloud.
For example:
Tell me about yourself.
Why do you want this role?
Why should we hire you?
Tell me about a challenge you faced.
Tell me about a project you are proud of.
What is your greatest strength?
Describe a situation where you learned something quickly.
Do not memorize complete paragraphs.
Instead, remember the main points you want to communicate.
That way, your answer sounds more natural.
11. Prepare a Strong “Tell Me About Yourself” Answer
A useful answer can follow this structure:
Present → Background → Relevant Skills → Evidence → Career Goal
For example:
“I recently completed my degree in computer science and have focused on Java, SQL and application development. During my academic project, I worked on the backend and database components and gained practical experience solving data-related issues. I am now looking for an opportunity where I can apply those fundamentals in a professional environment and continue developing as a software professional.”
Keep it relevant to the job.
Avoid turning your answer into a five-minute biography.
12. Speak Clearly Rather Than Quickly
Nervous candidates often increase their speaking speed.
That can make even a good answer difficult to understand.
Instead:
Pause briefly before answering.
Speak at a comfortable pace.
Use short sentences.
Avoid filler words such as “actually,” “basically,” “like” and “you know” when they occur repeatedly.
If you make a small mistake, continue calmly.
You do not need to restart the entire answer.
13. Prepare for Questions About Your Resume
Anything on your resume can become an interview question.
If you list:
Java
be prepared for questions about OOP, collections, exception handling and basic programming.
If you list:
SQL
be prepared for joins, grouping, filtering and basic queries.
If you list:
Cloud
be prepared to explain what you actually worked with.
The safest strategy is to list technologies you genuinely understand.
14. Prepare Your Project Explanation
Your project is one of the best opportunities to demonstrate genuine knowledge.
Prepare a two-minute explanation covering:
Problem → Solution → Your Contribution → Technology → Challenge → Result
Be specific about what you personally did.
Do not claim that you built the entire project if your actual contribution was limited to one module.
15. Understand How Aptitude Assessments Differ From Interviews
Aptitude tests are primarily about solving questions accurately under time pressure.
Your preparation should therefore include timed practice.
Focus on:
Quantitative aptitude
Logical reasoning
Verbal ability
Data interpretation
Pattern recognition
The exact sections depend on the employer and assessment.
16. Develop a Question-Selection Strategy
The biggest mistake in a timed assessment is spending too long on one difficult question.
Start with questions you can recognize and solve efficiently.
If a question is consuming too much time, move on when the test interface permits it.
A strong strategy is:
Easy → Moderate → Difficult
rather than:
First question → solve completely regardless of difficulty
The goal is to maximize correct answers within the available time.
17. Don't Guess Randomly Without Understanding the Rules
Some assessments have no negative marking, while others may use different scoring systems.
Do not assume the scoring rule.
Read the instructions shown at the beginning of your assessment.
Then make your attempt strategy based on the actual rules.
18. Avoid Technical Problems During the Test
Close unnecessary applications before starting.
Disable notifications where appropriate.
Make sure your laptop has enough battery or use reliable power.
Keep the charger nearby.
Use the required browser.
Avoid switching networks unnecessarily during the assessment.
If the assessment uses a secure browser, follow the official instructions rather than attempting to bypass its restrictions.
19. What Happens If Your Internet Disconnects?
Do not immediately panic.
First follow the instructions provided by the assessment platform.
Some systems may automatically save certain responses or allow you to reconnect, while others may require support intervention.
Mercer | Mettl advises candidates to follow the error message shown on screen or contact its support team/test administrator when a problem occurs.
Keep the assessment invitation and support information accessible before you begin.
20. Don't Try to Outsmart a Proctored Assessment
If an assessment is proctored, assume that the system is designed to detect prohibited behavior.
Mercer | Mettl documents features such as lockdown controls and monitoring designed to discourage or detect unauthorized activity.
Do not use another device, unauthorized software, another person or external assistance when the test rules prohibit it.
Apart from the risk of disqualification, relying on unauthorized help can leave you unprepared for later technical interviews.
21. Use the Platform's Practice Opportunity
When a platform provides a practice or system-check environment, use it.
HireVue, for example, provides practice interview functionality intended to familiarize candidates with the on-demand interview process.
Use practice sessions to check:
Camera framing
Microphone quality
Lighting
Speaking speed
Background noise
Comfort with recorded answers
22. Common Video Interview Questions
Prepare short answers for questions such as:
Tell me about yourself.
Focus on education, experience, relevant skills and career direction.
Why do you want this job?
Connect your skills and interests with the actual position.
Why should we hire you?
Explain what you can contribute rather than simply saying you are hardworking.
Tell me about a difficult project.
Use the STAR structure.
Tell me about a mistake you made.
Explain the situation, what you learned and what changed afterward.
Describe a time you worked in a team.
Focus on your specific contribution.
How do you handle deadlines?
Give a genuine example rather than a generic statement.
23. Common Aptitude Areas to Practice
Depending on the hiring test, useful preparation areas can include:
Quantitative: percentages, ratios, averages, profit and loss, time and work, time-distance problems, basic probability and data interpretation.
Logical: sequences, arrangements, coding-decoding, directions, relationships and pattern-based reasoning.
Verbal: grammar, sentence correction, vocabulary, reading comprehension and sentence arrangement.
Practice under a timer because speed is part of the assessment challenge.
24. What to Do the Day Before the Assessment
Do the final technical check.
Confirm the assessment link.
Charge your device.
Check the camera and microphone.
Prepare your room.
Review important concepts.
Practice two or three video questions.
Then stop studying at a reasonable time.
Trying to learn a large new subject late at night is usually less useful than arriving rested and technically prepared.
25. What to Do Five Minutes Before Starting
Sit down early.
Open only what the assessment instructions require.
Check your camera framing.
Check your microphone.
Make sure your face is clearly visible.
Keep water nearby if permitted.
Read the instructions carefully.
Once the assessment begins, focus entirely on the task.
26. A Simple Preparation Formula
For an online hiring assessment, think in four stages:
Technical Check
Make sure the system works.
Environment Check
Make sure your room and camera setup are appropriate.
Content Preparation
Revise the concepts relevant to the role.
Practice Under Time Pressure
Simulate the real assessment rather than studying only without a timer.
This approach is simple, but it removes many avoidable sources of stress.
27. The Biggest Mistakes to Avoid
Waiting Until Test Day to Check the System
Technical issues are much easier to solve before the assessment starts.
Memorizing Video Scripts
Over-rehearsed answers can sound unnatural.
Giving Very Long Answers
Answer the question directly and stop when you have made your point.
Ignoring the Role Description
Your preparation should reflect the actual job.
Using Unauthorized Assistance
Follow the assessment rules exactly.
Panicking After a Difficult Question
One difficult question does not determine your entire performance.
Final Thoughts
AI-assisted interviews and online assessments can feel unusual the first time you encounter them, but the fundamentals are still familiar.
You need to communicate clearly, demonstrate your actual skills and complete the assessment without avoidable technical problems.
Before an online test, remember:
Check the technology.
Prepare the environment.
Practice your answers.
Revise the relevant aptitude and technical concepts.
Follow the assessment rules.
And most importantly, be yourself rather than trying to manufacture a perfect answer.
Automated video platforms and online assessments can differ considerably from one employer to another, so always follow the instructions supplied with your particular assessment. Mercer | Mettl's current documentation shows that even its own assessments can differ between proctored and non-proctored configurations, while HireVue provides different types of candidate video workflows.
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