Dear Ayush,

If you are going to take through JEE main marks the 12th marks will not affect your admission either it is high or low, you just need 75% or above to be eligible. According to your percentile your rank should be around 2,75,000, you can also check your rank by this link.

The closing rank for CSE in SGSIT is 20K ( acc. to previous year data ) for the general rank so here I don't think you will get CSE, and for other branches you need to come under the rank of 100K to get any seat in this college. I would suggest to try another 2 attempt to increase your score or take any other government/private college in MP. You can also refer to this link to find the best college for yourself.

Best of Luck!!!