@usualhopeful Your idea is solid. But, it would require more work for CB, so they’ll never adopt it. And @Plotinus: No two tests will ever have the EXACT SAME difficulty level when you out to ten decimals.
Even still, it’s wrong that CB reuses problems in the first place. Certain problems are ‘memorable’ and hence the answers are easily remembered. What I mean is that no one needs to memorize the easy math questions, etc. However, for the 1-2 challenging (aka tricky) math questions, it’d be nice to have some muscle memory (i.e. the answer to the Johnson Farm question is 18 legs).