Warangal

Yes, you can change the Polytechnic College from Siddipet to Warangal. Transfer in Government Polytechnics is very common in the first year. So please contact to your Head of Department regarding this and also approach to Warangal Polytechnic college for the availability of seats.

Based on the TS EAMCET rank you obtained, you can the following in asked college under general category.
1. ECE
2. EIE
3. ECI
4. Civil
5. Mech
So chances for getting CSE are moderate here.

Keeping the last years of trends in consideration, you can get the following in Kakatiya Institute of Technology and Science.
1. ECE
2. ECI
3. EIE.

Prefer to go with CSE if getting at NIT Raipur or IIIT Lucknow. Chemical is another good option at NIT Surathkal or Warangal. But not opt for MME.