Dear nirmal if you are study hard and if you solving the previous year question paper of Wbjee and Jee Main , and thoroghly study your text book , if you do this  you are surly prepeard for Wbjee and Jee Main exam.

• Try to first follow the conceptual books like NCERT , RD SHARMA etc.
• After building your concepts enough then try to go for the other books like HCV , I.E Irodov, Arihant etc
• Try to do the various mock test and previous year papers of these examination such that you can build up the confidence in yourself.
• Try to do the first complete the NCERT first then only go for the other books.
• The previous year paper will give you the fell of the current scenario of these exams.
• Follow the proper time table and routine with having the proper schedule of every subject of PCM.
• And try to play some sports in the evening which help you a lot to relieve your stress.