IIT

For top IITs CSE branch, you will need under 1000 rank and for IIT BHU ECE branch you will need to score under 3000 rank.

IIT Kharagpur's first-semester fee is Rs 25,950 with a Rs 6,000 refundable fee and Rs 10,550 for subsequent semesters. "Currently, IITs charge between Rs 20,000 and Rs 50,000 as annual M.Tech tuition fee. The cost of IIT education per year is around Rs 7 Lacs. This is being stated online. You can check.

Hi,
You must qualify GATE with a rank under 400 for PSU.

Hi,
Candidates having first-class Bachelor's degree (minimum 60 % marks)in engineering, technology, electronics, communication, mechanical engineering, and computer Science can apply for SET exam. Age Limit for DRDO SET Exam is 28 years and You must be a citizen of India to apply.

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All candidates (other than those applying with a 5-year integrated M.Sc. Degree) must additionally have a minimum of 60%* aggregate marks in B.Sc. Applicants opting to be considered on the basis of a GATE Score should have a valid GATE-2018 or GATE-2019 Score in 'Chemistry'.

Hi,
Just go through this link and fill out the required details
College predictor in Shiksha
https://www.shiksha.com/college-predictor

At least 40-50 marks out of 100 marks in GATE exam is required to get civil branch in good IIT for general candidates.

IITs do not offer undergraduate courses on astrophysics.

For physics : H. C. Verma or Arihant. For chemistry : NCERT is best. For Maths : TMH
But the main thing is to go through previous year JEE questions which will give you an idea and many of the questions will clear your misconceptions.

There are different entrances for IIT architecture courses.