IIT JAM

Hello,
Yes, you can apply.
You just need a graduation degree with minimum 55% marks for General & OBC and 50% marks for SC, ST categories from a recognized university.
But if you wan to appear in the IIT JAM Exam, then you must also satisfy all the other eligibility conditions. Check all the conditions regarding IIT JAM Exam here: https://goo.gl/fNdqWo IIT JAM 2018 Exam has been conducted on 11th February 2018.
So, if you wan to appear in the IIT JAM Exam, then you can appear in the 2019 Exam.
IIT JAM 2019 Exam will be conducted in the month of February 2019. So, you have enough time for the preparation.
Best of Luck!

Yes, you can get admission in IIT Delhi, but it may somewhere struggling for CS branch.

It will be better if you go for a graduation related to Mathematics. Because it will eventually help you in your preparation for IIT JAM Mathematics.

There is no need for science stream, but you have coding skills hence you are eligible.

Both are better but IIT, Bombay gives better placement than IIT, Kanpur. The infrastructure of IIT, Bombay is also better and it is listed in top 10 universities of India.

Hello Dear,
There are no specific eligibility criteria up to my knowledge, You must have 50% aggregate to write for the exam.

Hello,
Yes, yes you can. IIT JAM Admission 2018 has been started from 03rd April 2018 and will end on 17th April 2018. Check the complete IIT JAM Admission Procedure here:
https://goo.gl/PX4PqC
Admission in the academic programmes will be made on the basis of the merit list of JAM 2018. Only those candidates who have cleared any one of the two test papers are eligible to apply for IIT JAM Admission in academic programmes and they must satisfy the minimum educational qualification and eligibility criteria specified by the institutes.
Best of Luck!

You need around 50 marks but it basically depends upon the difficulty level of the exam. Go for the exam with clear mindset.