Derivations are not that important.
You should practice as much as you can.
Now practicing more problems would help you memorize the formula which you would find hard to memorize normally.
And if you practice more you would be able to solve the enigma of the pattern of question.
Don't waste your time on derivations.
The results are important not the derivations.
Because in exam hall you would not be able to derive results you have to memorize
And if you want to solve conceptual questions then just
Follow any text book of physics which you find easy like you can study DC pandey .
Just go through the theory atleast once .

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