is there any website to clear doubts of mathmatics

Dear rishabh,

Who else can clear your doubts better than IITians themselves...You can ask your doubts online thru askIITians and you can have only discussion with IITians also..

We are all IITians and here to help you in your IIT JEE preparation.

All the best.

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Hi rishabh,

You may post your quarries in the forum post column of the web sites dealing with AIEEE. Also for clearing the doubts through one to one online guidance check this: 

What are fifth,sixth and seventh nearest neighbouring distance and number of atoms in simple cubic lattice?