Use your own shortcuts for topics to refer it at a glance Highlight points with different colour markers to segregate topics based on priority
Add whatever questions you find difficult to solve, be them test questions or book questions, in your notes.
For Physics, go through the chapter and study all the derivations. Then write only the formula and key points of derivations .
For Chemistry, aim primarily on organic chemistry. Formulate a table stating name of reaction, reaction pathway and miscellaneous questions as the headings.
For Biology, write only those points in your notes which you find are forgetful. Add all the miscellaneous points and lines of the NCERT to your notes.
Try searching for information from different sources for the same topic, where you will have the best set of information on that topic