The SC Other State Cutoffs for your preferred options are as follows,

CSE Trichy 51

CSE Surathkal 101

ECE Trichy 239

ECE Surathkal 338

SC/ST Rank somewhat varies with the CRL across years. But I would advice you to secure a ST Rank in this Range, you must target atleast a CRL between 50-60k, and hence, a Corresponding ST Rank enough to secure a great seat at NIT Trichy, Surathkal as well as Warangal and other Top NITs. For a CRL between 50-60k, you mist target a Percentile anywhere around 95 or a Corresponding score anywhere around 100-110/300 in JEE Main Attempt.