1st step is cry
2nd step is try mindmapping as much content as you can remember based on each of the modulessss
go through the syllabus to fill in gaps
it helps
i dont have for prelim but i have mindmaps for hsc
Notes are inefficient and frankly are just you linearly learning, something the mind has not adapted to - Justin Sung. Mindmaps are likely a better alternative (especially on an ipad or something). Use the Ebbinghaus Forgetting Curve to your advantage!! Also remember to prioritize sleep and your wellbeing!
All the best in the prelims