Hello dear
To score good marks in advance you can not skip any concepts or topics because many things are related to one topics and all are interconnected. If you skip one topic the whole chapter will be effected.
But instead of it the main topics and chapters which come in exam are :
Maths : trigonometry, algebra, calculus and differential, permutations and combination, geometry ( circles,ellipse and hyperbola).
Chemistry : organic chemistry, thermodynamics, atomic structure, states of matter, s p and d block.
Physics : rotational, optics, electrostatic and dynamic. Current, fluid mechanic, thermodynamics
These are most important topics but most of these topics are based on other basic topics and there is 2;3 questions from a chapter so you can be sure that the question will come from this particular topic.
Good luck

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