Which are the toughest topics of JEE MAIN of Physics

It varies every time , and its unpredictable every year thre is change in the difficuty of every subject you have to prepare three of them equally because you never know which subject will be difficult , this is not true that only physics is tougher and seriously saying this difficulty level depends upon you preperation level

Hii bhima

There is no topic so called toughest. One who don't study that topic appaers him to be toughest. So if you study whole portion,  the subject will appear to be easy to you.

Some of student find circular motion as tough while some one finds some other topics

So not topic is so hard if you study it.