As far as boards are concerned all the topics are equally important but these should be given more focus than others in case of competitive exams
Maths – conics, complex numbers and calculus.
Physics – kinematics, thermodynamics, magneto stats, electrostatics, rotational, gravitation.
Chemistry – chemical and ionic equilibrium, chemical bonding, organic, qualitative analysis.
Avoid using any calculators while you practice numerical problems because they hamper your calculation speed.
Prepare a time table and stick to it religiously; the time table should be made keeping in mind your exam timings so that you can perform with greater efficiency.
Students who get stressed out soon, should take up to meditation and yoga. It helps in maintaining a good pace for preparation. Also, it would be quite helpful if you suggest your mom to give you a nutritious diet consisting of cereals, milk, fruits etc.
Putting off your sleep is not at all advisable because it makes you more lethargic for the days to come. A sound sleep of 6 hours will do but not less than that, taking a short nap of 30-40 minutes in the afternoon would be a boon.
Apart from preparing for the exam it is even necessary to have a compatible strategy for revision because when the student has to face both the boards and competitive exams it becomes difficult to handle the pressure.
When you are having a vast course to revise you must first tabulate as to which ones are the topics you are comfortable with and the ones which still pose a problem for you. Remember, that simply working on topics you are weak at won’t be of any good if you leave aside the strong ones. As when you stand at a three months step from the exams, you ought to build up a confidence, because, that helps in obviating stress from building.
As in my opinion, hand written notes have a greater impact on your gray matter than the books so, it is best if you take the revision from your tuition/class notes.
Your revision times should be equally divided among the subjects because all the subjects need equivalent attention.
Remember what it is important to iron out your weak areas but at the same time you should not compromise on your strength because you do not have to just clear all the cut-offs; your real aim should be to score high so that you get a good rank and hence a good college.
