First of all read the basic concepts
Don't go against  them   while solving questions
First pick up easy questions 
Solve them note the mistakes u did
Now move to higher level following this 
Don't repeat the same mistakes
No problem if u do new mistake each time but please don't repeat them 
Now pick up HCV 
SEE solved questions
Practice them
Now don't skip short questions and objective type questions of HCV they are must 
COMPLETE HCV 
Now make small nb and write all ur common mistakes,pledge not to repeat them 
Practice as much as u can 
Mechanics grows with microphone time
It's best and easiest part of physics
U can also buy a book called PHYSICS TEACHER (VERSUS LEARNING) it awesome
Hope it helps u
😁
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Generally speaking, Mechanincs is difficult to master. For example, if you were to spend 2-3 weeks on modern physics you can easily master it, but it takes much more time to master mechanics. Id suggest, try understanding basics of LOM or friction throughly, its very important, then quickly jump to JEE/NEET previous year questions and learn some tricks on how to solve them.