Quant Interview Error Log
How to build a quant interview error log that turns missed practice problems into targeted repair blocks.
Candidates who keep repeating the same quant interview practice mistakes.
Track cause, not embarrassment
An error log is not a list of failures. It is a routing table for practice. For each miss, record the prompt, method, cause, correction, and next drill. Keep it short enough that you actually use it.
Use cause tags
Useful tags include setup, method choice, arithmetic, time pressure, communication, knowledge gap, and careless review. The tag should determine the repair. A setup miss needs method work; an arithmetic miss needs a different drill.
Review weekly
At the end of the week, count repeated tags. The most repeated high-impact tag becomes the first repair block next week. If no tag repeats, use mixed practice to keep recognition broad.
Concrete log entry
Prompt: two-card ace probability. Cause: treated draws as independent. Correction: denominator changes after first draw. Repair: three without-replacement card problems, then one mixed probability set.
Retest repaired errors
Do not mark an error fixed because you read the solution. Mark it fixed after you solve a variant correctly in a mixed set. That is the difference between familiarity and interview readiness.
Common mistakes
Candidates often make logs too detailed or never review them. The simplest useful log is better than a perfect spreadsheet nobody opens.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.