Hi Naman,
12747 rank is really good at SRMJEE.
According to the last year statistics, The CSE at the main Chennai campus of SRM closed at the rank of around 10,000 for the last round.
So except CSE at the Chennai campus, you have all the branches available to you like IT, Mechanical, etc.
Hope it would help.
Thank you.

Hi Naman!!! Congratulations on your rank!!! I am happy to inform you that if we see the latest trends in cutoff,you'll get all courses in the chennai campus but getting CSE will be little tough as last year's CSE cutoff was 10,000 in the main campus but it may change too and you can get CSE easily in any other campus. For more details visit https://engineering.careers360.com/articles/srmjeee-cutoff

Wish you all the best. Thank you