If you spend 3 hours on a mock and 15 minutes analysing it. You are doing it wrong. How I analysed my mocks!
Your percentile will move without you learning a single new concept provided you do this properly.
Spend equal amount of time in analysing the mock exam
Before you look at answers, re-attempt every wrong question untimed. See if you got it correct. If no, it was a knowledge gap. If yes, then it was a time-pressure error / silly mistake which is fixable. Also, these questions are whats important to get right.
Categorise every wrong / unattemped answer into buckets; Buckets I used were a) Dint know it, b) Knew it but misread it or made a silly mistake, c) knew it but no time to attemt, d) Conceptually wrong - should not have attempted
That d) category are the most dangerous ones. You are spending time, thinking you know it but there is a knowledge gap. Learn how to see through such questions and topics. Never select them till you learn the concept
Now make an excel sheet with this. also mark the topic in one column for each of these question.
Atter a few mocks you will start seeing a pattern. Across topics. And you will also start gaining widsom on how to select questions - which I feel is very important because it is a time bound exam.
Bring some structure to your analysis.
If anyone wants to discuss a template for this, feel free to post on r/GIM_Goa. We'd be happy to help