If you belong to any coaching institute well and good for you!!
Mole Concept, is a fairly easy chapter. Finish it first. Byheart each and every formula. Keep a formulae notebook that also includes some “note” and “important” kind of stuff. (I myself have done that)
Solve as many sums as you can from your Coaching booklets. They prepare the base of type of questions. It is also advised to go through the Ncert sums as I guess the theory is too elementary.
Now, Atomic Structure is big chapter that needs a lot of memory power (for the theory which, is a major part of the chapter) and pen down the formulae in that book which I have advised. It is more than handy.
Again, the theory part will be easier to solve in your booklets, what is a bit tough is the numericals (only because of the loads of formulae. ) The questions will be no doubt formulae based but, remembering them is a pain in the a**. It would be advised to read the chapter from the Ncert thoroughly for the theory.