I have done B.Tech in computer Science. Am I eligible for TGT or in B.Ed which subjects do I need to take?

After B.Tech, you are eligible for B.Ed. In B.Ed all subjects are compulsory for all either he/she is from science stream (B.Sc, B.Tech, etc) or arts stream (humanity, BA, B.Com, etc.) and for the post of TGT, there is no direct post.

Yes, you are eligible for TGT and B.Ed.