will it be good to write the formulas and basic concepts in a copy while going through study materials and books so that it can be used during exam time?

Yes, writing formulaes helps u a lot, Write formulas topic wise for each chapter and revise it before exam, mostly formulas in maths,

thats makes u confident and can solve problems very fast, ( no need to derive formulas again in case of properties of triangles)

gud luck with u r prep.

regards

Ramesh