i m weak in maths....can u suggest me a good book for calculus for joint levels so that i can improve my basics before going through tough problems

Go for Arihant. Their books are really good.

You must read "Thomous calculus" book first.

Go for R.D.Sharma subjective first.

Then go for Amit Agarwal books (arihant) for calculus.

They are extremly good.

GOOD LUCK!

“Calculus:graphical,numerical,algebraic” by Thomas,Finney, Demana, Waits (one or more authors from MIT, USA)

Arihant Integral Calculus, Arihant Differential Calculus

the best thing you should do is solve ncert fully ..then move for skills in mathematics for jee
solve the examples first then solve the objetive ques then go for subjective ones
it will surely help

Plss approve :) 

arihant books are good