Exam

You might have a chance if you have any reservation criteria else give it a try. You have very great chances to get into this institute with this rank.
Attend the counselling and choose your options appropriately.

LEET is the entrance exam for candidates who wish to get lateral entry in the engineering colleges. Now I can't say if you can give LEET exam or not, because you have not mentioned any information about your course. Lateral Entry Scheme is basically for the candidates who have completed either Diplo

No, JEE Mains score doesn't come in hand while taking admission in Galgotia’s University.
Galgotia’s conduct their own GEEE examination (Galgotia’s Engineering Entrance Exam) + you can check their eligibility criteria (subject to change shortly) from this link:
http://www.galgotiasuniversity.edu.in/e

If you have passed your class 12 with that percentage, then you can definitely sit for NIFT entrance.

It'll depend on what branch you want. With 104 marks you'll get biotech, biomedical, print and media technology, automobile and aeronautical mostly. With 51000 rank, you'll get biotech and biomedical at SRM.

No, you will not get CS with the score of 99 marks. You'll need atleast 140/200 to get CS for sure.

You have to score above 95 percentile for a safe BET on your entry to IIMs and other reputed colleges.

Time is very precious. Put extra hard work, accommodate more time for preparation. Don't drop 1 year just for coaching. Paralleling you need to do something which is achievable at the end of the year.

It is not advisable to drop two years just for the preparation of CLAT. It is a very crucial period you, have to put more hard work and efforts.