Hey Sunil,
Yes you are eligible for  TS ICET examination.
According to their eligibility criteria, all you need is a graduate degree from a recognised university with 50% marks.
IF you have done your B.Tech from open University, then it must be recognised by joint committee of AICTE, UGC and DEC.
You can get further details from the link below:
Eligibility criteria for TS ICET 2020

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