Best IIT college in Many ranking is IIT Bombay, Now cutoffs are different for Different courses and different categories, Since You does not mention any Branch and category, You can go to the opening-closing rank portal of JoSAA which will help you to determine the rank you need to get

Any 3 year or 4year degree equivalent from recognised University and with minimum qualifications marks will make you eligible for university across Germany  

Students thus should have appeared for relevant entrance exam and valid score is needed. 

Students must however fulfill all individual criteria setby colleges as each of tgem

Hey.

Here is a list of a few top colleges for Mechanical Engineering after All the IITs.

NIT Tiruchirappalli, Tamil Nadu 

NIT Rourkela, Odisha  

NIT Surathkal, Karnataka  

NIT Warangal, Telangana

Motilal Nehru NIT, UP

Visvesvaraya NIT, Maharashtra  

NIT Calicut, Kerala 

Sardar Vallabhbhai NIT, Gujarat

BITS Pilani

Delhi Technological University

BITS

If Im Not mistaken you are asking best IIT for CSE engineering. IIT like Bombay, Madras, Delhi, Kharagpur are topclass for CSze with excellent placement of 100% and average package is above 6lpa. Faculty and learning curve is amazing at above IITs. 

Hello,

Suggestions for best colleges to pursue Aeronautical Engineering course in Tamil Nadu are listed below:

• Sathyabama Institute of Science and Technology, Chennai
• Hindustan Institute of Technology and Science, Chennai
• Bharath Institute of Higher Education and Research, Chennai
• KCG College of Technology, Chennai 
• Vinayaka Mission's Research Foundation, Salem

Hi, please go through the following careers360 link to get the list of engineering colleges in Tamil Nadu

https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-tamil-nadu

General branch wise rank list for a few top-IIT branches is as follows:

• CSE - AIR < 500. (net score > 70% of max marks, achievable by MINIMUM -ve score and CORRECTLY SOLVING ALL THE EASY AND MODERATE QUESTIONS THAT MAKE UP ~80% OF THE PAPER).
• Maths and computing -