Hello Sachin,
Firstly, here MEC mean Maths,Economics and Commerce if I am right.
And also you are a b.com computer student. Through this information provided by you, Yes you can apply for tsicet exam for MCA. It has a certain eligibilty criteria. Here it is according to the notification released by the board.

• Candidate shall be an Indian National.
• Candidate should belong to the State of Telangana /Andhra Pradesh as defined in G.O.(P).No. 646, Education (w) Dept., dated 10-07-1979 and its subsequent amendments.
• However maximum eligible age for obtaining a scholarship is 30 years for OC candidates and 34 years for other candidates as on 01-07-2018 as per the guidelines prescribed in Memo No. 10537/SW(Edn.2)/2011,dated: 20-10-2012 and further guidelines issued from time to time by Social Welfare (Edn.) Department shall apply.

The candidate seeking admission:

• For MCA : Should have passed Recognized Bachelors Degree Examination of minimum three years duration (except Oriental Languages) with Mathematics at 10+2 level.
• The qualifying Degree obtained by distance mode program should have recognition by Joint Committee of UGC, AICTE and DEC/DEB.
• Mere appearing for TSICET-2018 and obtaining a rank does not entitle a candidate to be considered for admission automatically unless the candidate fulfils the requirements laid down for admissions.

Here I am sharing the link of very same. It was issued for tsicet 2018. You can go through it fully.
Link: https://tsicetd.nic.in/auth/TSICET_2018_FINAL_NOTI.pdf

I hope this helps you.

All the best !!