Hloo ayush

If u willing to get into IIT then this is the right time.To get expertise in maths then start preparing basic level books like 

Rd Sharma Objective Mathematics for IIT JEE

This book have questions from basic to high level .In this there are large no of questions .so only do examples.Try to analyse each and every question to understand the concept and stuck to only one book.ART IS NOT DOING NO.OF QUESTIONS BUT ART IS DOING 1 QUESTION IN NO. OF WAYS.After understanding the concepts try to solve previous year question.Do practice on regular basis.Try to solve the question without taking help of solutions. For previous year question papers go through this link

https://engineering.careers360.com/download/sample-papers

All the best

there are certain topics which you can study for iit jee preparation,while you are in class 10. Some of them are:

• quadratic equations
• limits
• trigonometry
• coordinate geometry
• parabola,hyperbola,ellipse

it is better if you know the basics of differentiation

try to solve past papers of jee main with the basic concepts you have currently, and learning these chapters will help you in many competitive exams like KVPY and NTSE.