meri chemistry ka base weak iswajah se thoda sa smjhne m dikkat hoti h btaiye m kra kru ...plzphysics and maths memeri bahut achi command hai pr chemstry m nhi kya kru ...

You can first clear the base from ncert. Solve its questions and prefer a help book like companian chemistry dinesh. By solving step by step you can form your base strong and then can be able to solve iit questions

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For strong base in chemistry you must go thoroughly through the NCERT book of chemistry and solve the exercise question given at the back 

You will surely gain a strong base 

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read ncert thouroly.

practise a lot of numericals

 Your weak point is chemistry..so work on it

Start with the Inorganic chemistry first,by roughly reading each chapters and try answering them

Next, note the questions which remained unanswered....in that way proceed...!!

    About the formulas, trying writing them down..

Hi,

Best books IIT JEE preperation -Maths Physics and Chemistry

Chemistry 

1 P.Bahadur(G.R.Bathla & Sons) Numerical Chemistry Physical Chemistry
2 O.P. Tandon Physical Chemistry 
3 O.P. Tandon Inorganic Chemistry 
4 O.P. Tandon Organic Chemistry - use this as a primary one
5 Paula Bruice Yurkanis Organic Chemistry 
6 J.D. Lee Inorganic Chemistry 
7 Bruce H. Mahan University Chemistry 
6 Organic Chemistry by MORRISON & BOYD Organic Chemistry 

This is the good method and wish you all the Best