hi,

see the last month preparation is really important and right now I suggest you to not study any new topics, which might cause you to forget the previously studied chapters. if you have seen the questions pattern mathematics questions is bit lengthy and if you practice daily right now you may able to score 80 percentage questions in exam, also the most of the focused should be for 12th syllabus, same things goes for physics chemistry or biology exams. make some short notes to revise before the days for exams.

all the best for your future endeavor.