With the rank you're mentioning you can check out these colleges accepting TSICET scores for MCA 

• KU Arts and Science college 
• Auroras PG college MCA 
• Avanthi PG college 
• Mahatma Gandhi University College of Engineering and Technology 
• Vaageswari College of Engineering 
• RBVRR Institute of Technology 

These are a few colleges you may get as per your rank but you should also check out some other good colleges accepting different Management entrance exams. 

Good luck 

You no need to worry about your rank and Caste, you got good rank in TSICET, and you can get good college for doing MCA.

• CBIT
• Aurora's PG college
• TKR College
• MGIT
• Vasavi Engineering college
• Mallareddy instutions etc 

and other so many college are there so you have to decide which college you are going to study. All the best for your future.