CAT

You may refer to following link for all details on CAT 2016 examination: https://iimcat.ac.in/per/g01/pub/756/ASM/WebPortal/1/index.html?756@@1@@1

Both have different formats of studying. For CAT, you need to focus on data interpretation, logical reasoning and verbal aptitude with as much as mock exams you can give.
For TOEFL, you need to focus and practice your speaking and hearing skills and need to be well versed with words and synonyms.

Yes, you can apply after the CAT result.The deadline is Jan 31 2017.
Application forms should be out shortly

yes you can. all major b schools in India accept GMAT scores. 650 is a good score. minimum cut off for IIMs is 550 .

There are many entrance exams apart from CAT. It totally depends on the college you are interested in.
For example, CMAT, XAT, MAT, and SNAP are few of the national level management entrance exams. To get admission in the Symbiosis Business School, a particular candidate should apply for SNAP test.
Registrations have already started.
Last date of registration is:
SNAP - 22nd November 2016
SSBF - 7th January 2016
Good luck.

Hi,
Your graduation marks just help you to fill the form, apart from this your CAT score card matters.
Good luck.

80-85%ile is the likely cut off