What will be the time management for top the iit's

Hi, The best plan is to work smartly and that means to focus on the important topics mainly.
So below are some important topics to consider:
Physics : Mechanics and Electrodynamics are the two most important topics but one should also devote time to Heat, Thermodynamics, Optics and Modern Physics.
Chemistry : General principles of Organic Chemistry are easy to understand. Numericals of Physical Chemistry are scoring. Inorganic Chemistry has many facts and figures and requires constant revision. Mathematics : Master interrelationship between various topics. Coordinate Geometry and Vectors can help one to solve problems related to complex numbers. Permutation and Combinations help you to solve problems of Probability. Trigonometry and Calculus again help one to solve all types of problems.

After you focus on these important topics, you can focus on previous year papers.
Also the other main step is to practice JEE mocks as much as you can and even analyse them in depth.
Follow the above and it shall help you.
Good Luck.