I didnt get your question properly however i hoe below mentioned points would benefit you.

You can sit in JEE Main and JEE Advance to get into NITs and IITs respectively. If You manage to qualify the exam by achieving the cut off, You can apply for JOSAA Counselling. It should be noted the cut off for EWS/SC/ST/FEMALES/OBC category is lower than the general category
However It is usually advised to fill the choices as per the preference of colleges and departments, for example CSE in NIT Trichy is your priority followed by CSE in NIT Warangal, you can fill CSE at NIT Trichy at serial number 1 and CSE at NIT Warangal at serial number 2 and so on and so forth. However to get any NIT, you must have qualified JEE Mains and to get any IIT, you must have qualifies JEE Advanced

But the previous cut offs of colleges should be taken in consideration, it is better to research over the cut off of colleges then make a preference list of colleges and fill accordingly

For the college preferences and the courses provided by these colleges and to know which colleges participate in the JOSAA counselling, please go to the below mentioned link: https://engineering.careers360.com/articles/josaa-participating-institutes/amp

For college prediction as per your marks and rank, please go through the below mentioned link:

Rest for information on any particular college, you can dig their official site for better information

Paper I was held for B.E/ B.Tech aspirants, and Paper 2 for B. Arch./ B. Planning. The exam pattern of JEE Main 2018 has been given for both Paper I & Paper II for the benefit of the aspirants. The JEE Main exam pattern 2018 for both papers show that the exam duration of both the papers is the same - hours each
or you just check this website........
https://engineering.careers360.com/articles/jee-main-exam-pattern