JEE Advanced

Yes, you can pursue B.Tech without giving JEE Mains and Advanced. In that case you have to opt for private engineering colleges.

You can buy question sets of any coaching institutions (like Vibrant, Allen, Resonance, etc.) or you can also buy question bank of any publication from the market.

There might be some age constraints and if you are already a graduate then you cannot apply for B.Tech again.

Hello Priyanshu,
Please do visit t this link for your doubts to be cleared.
https://www.shiksha.com/b-tech/exams/jee-advanced
All the best.

Admission letter or offer letter is the letter given to the student when he/she gets any seat in any institute in any round of counselling. If a person gets a seat in any round, then he will be able to download the letter from JoSAA website. Another letter will be given to the candidate at the reporting centre.
Best of luck!.

Both the brands BITs and IIT are prominent ones. Difference lies in the fees, location near your home, curriculum, placement stats etc. There is difference between the subject content of both the branches. Check this link to know about ECE. http://www.bits-pilani.ac.in/Hyderabad/EEE/Programmes
Make your decision wisely.

Please elaborate your question for better assistance.

Hello,
You can input the details in the below link to find out which colleges you can get:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6375912
Accordingly, you can take the decision.

You should try in josaa counseling.