Hi Harsewak!! Nice to know you are getting involved….
Well, the easiest way to learn derivations in Physics is NOT TO MUG THEM UP!! Sounds absurd!! No it isn't. You see, just like math, physics is based on concepts, logic and your analytical ability. These have to be developed over a period of time - through proper practice. Just like you cannot mug up playing a square cut in cricket, or how to strike a banana kick in soccer. Your coach has to guide you - through technical inputs. That is why class room instructions are so important.
At the present moment my advice would be to go through the notes I have given you guys in class. See where you are getting stuck up. Wherever you find a problem get back to me.
Remember, there are no short cuts……..
Nikhil