Hlo frnds I am tharun. I want to study B.Tech.

First of all you need to pass 12th with minimum 45% for admission in any college. You need not to be above 24 years. JEE is a must nowadays except for some private colleges. If you want a seat in NIT or IIT you need to crack JEE Mains and Advance. For admissions, you need to get atleast 70% in 12th.