IIT

Hello Vinay,
The BITSAT scores are not considered for admission into IITs. Only the JEE Advanced scores and your ranks determine your admission into IITs. I think you can get IITs, but if you don't, then go for BITS as you are saying that you are having a good score in BITSAT.
Both are almost equal but BITs Pilani is a private university, whereas IIT is a government one so fee structure will be a huge difference.

Yes, there are chances of increasing the cutt-offs this year. Around 200 marks should be required in JEE Advanced for getting in CSE in IITs.

Hello Amarpali,
Please visit the link for complete detail about you closing rank for different branch by josaa
http://josaa.nic.in/Result2016/result/OpeningClosingRank.aspx

If you don't have 75% marks in board exam, then you are eligible.

For CSE you should atleast have around 300 marks.

Hello,
Please make it clear about, what you want to ask as your question is bizarre.
IIT is an institute related to engineering and technology. IIM is related to management studies. If you want to pursue management, then IIMs are the best and for engineering IITs are the best.

Hello Prahalad,
Refer the link below to see the list of courses that are offered at IITs:
http://www.iitjee.org/iit-courses.html
Not all IITs have all courses. For example IIT, kharagpur offers B.Arch, whereas others like Bombay don't offer it.