PLEASE TELL ME WHAT ARE THE SCORING TOPICS OF IIT JEE?

Nothing as such,everything depends upon your interest towards the topic.But still i can suggest you to prepare the following chapters subject wise for scoring well in IITJEE.

In Physics be strong in thermodynamics,optics,modern physics,electronics and communication and properties of matter.

In maths the following chapters consist of more questions 
coordinate geometry, integral Calculus , vector , dimensional geometry and determinants, trigonometry.

In chemistry get strong in Organic and Inorganic Chemistry,Physical chemistry.

Hope this will help you.

Thanks!!!!!!!