Hey Pavan Kalyan,

Congratulations for your  rank in TS eamcet!

You have quite more  possibilities in getting admission in top college for Mechanical  engineering branch! 

Yes you can change the college to JNTUH in second counselling! 

All the engineering  college possibilities can be found by the given following website link which is a college predictor tool,

Http://www.engineering.careers360.com/ts-eamcet-college-predictor

Hope you get an admission in top college! 

All the best!