With a score of 120 in JEE Mains and 91.2% in CBSE, you are fit for the IT or EC branch in IET DAVV in the second round of counseling by DTE. 

In the past, students have got the IT/EC branch at such scores or even less. I have a friend who is an alumnus of IET DAVVa and his score was 125 in JEE and 87% in MP board. 

There’s a good chance that you will be selected. As for SGSITS, with this rank, you can easily get any branch you like.

Here is the required cutoff for IET DAVV and SGSITS in recent years.

However, if you don’t get the desired branch through DTE counseling for IET DAVV in the first and second round, you can seize any lower branch and apply for Internal Branch Sliding.