on 25%ile which NIT's IIIT's should I getin rank 103812 in jee mains belongs to SC catogery

With 25 percentile in JEE Main, your approximate rank is ~103,812 (SC category) . Here's a short list of NITs/IIITs you may target:

Colleges You Can Target

• NIT Agartala – Core branches like Civil, Mechanical

• NIT Puducherry – Core branches

• IIIT Bhagalpur – ECE, IT

• IIIT Kalyani – IT, ECE

• GFTIs like Assam University or UPES for specific branches

Check your chances accurately here:
JEE Main College Predictor – Careers360