Agent Ambo · Upskill
Data Scientist interview cheat sheet
The Data Scientist facts interviewers expect you to know cold. Ten minutes of revision the night before.
AmboQuick revision
- Precision
- TP ÷ (TP + FP): of predicted positives, how many were right.
- Recall
- TP ÷ (TP + FN): of real positives, how many were found.
- F1 score
- Harmonic mean of precision and recall.
- Overfitting signs
- Training score high, validation score much lower.
- L1 vs L2
- L1 (lasso) can zero out features; L2 (ridge) shrinks them.
- Bagging vs boosting
- Bagging reduces variance in parallel; boosting reduces bias in sequence.
- ROC-AUC
- Ranking quality across all thresholds; 0.5 is random.
- Data leakage
- Using information not available at prediction time.
- k-fold CV
- Train on k−1 folds, validate on the last, rotate, average.
- Embeddings
- Numeric vectors where similar items sit close together.
Must-know topics
Rehearse these out loud
- Explain the bias-variance trade-off.
- Your fraud model has 99% accuracy. Is it good?
- How do random forest and gradient boosting differ?
Revision is good. Practice is better.
- 1Ambo reads your resumeYour skills, projects, years and the role you want next.
- 2Then where you’re interviewingAnd how interviewers there question people like you.
- 3It maps every topic they could askMust-know first, your own projects included, built into short daily lessons.
- 4You practise, then get certifiedInterview Q&A after every lesson, then three proctored rounds ending in a voice interview with Ambo.
Questions, answered.
How should I use this Data Scientist cheat sheet?
Revise it the night before and the morning of your interview, then say each answer out loud. It covers Precision, Recall and F1 score and more.
Is a cheat sheet enough to clear the interview?
It helps you recall facts quickly, but interviewers test how you apply them and follow up on your answers. Practise answering, not just reading.
How is this different from a list of interview questions?
A list is the same for everyone. Ambo builds your course from your resume, your target role and where you're interviewing, then writes every lesson from the interviewer's point of view: what they'll ask, a strong answer, and the follow-up they'll use to test you.
What is the certification test?
Three camera-proctored rounds that unlock one after another: an objective round, a hands-on round (coding or practical tasks for your role) and a voice interview with Ambo, who asks live follow-ups on your answers. Pass all three within 14 days to become TickBig Certified for 12 months.
Revise it, then rehearse it.
Ambo interviews you on Data Scientist topics and follows up on what you say.