Hello dear

It is difficult to say that the exact weightage of this chapter will come in for exam because syllabus is very vast and a number of topics . Some questions which come from the important topics are

Fluids, thermodynamics, rotation, vibration,kinametics from physics .

Permutations and combinations , algebra , trigonometry, calculus from maths

Organic , thermodynamics, atomic structure, states of gases from chemistry .

But one thing you should keep in mind that it is not possible to get a good score if you only study selected topics only because we don't know that which topic will come from a certain chapter and many of topics are interconnected .

Here i am providing you a link you can check the syllabus here

https://www.google.com/amp/s/engineering.careers360.com/articles/viteee-syllabus/amp

Good luck