sir, GATE score 661 & rank 1286 with ECE as OBC which old IIT and new IIT i can got seat for M tech VLSI, Communication,

Hii

Based on your score the college offering VLSI are- NIT bhopal, Jadavpur university, NIT surat, NIT silchar,  COE Pune, NIT jaipur, NIT jamshedpur,  NIT jalandhar,  NIT surat, NIT durgapur, NIT hamirpur,  NIT calicut, NIT kurukshetra,  IIT roorkee, NIT allahabad, NIT trichy

The college offering communication engineering are-

IIT kharagpur , NIT Jaipur,  DTU, NIT patna, NIT bhopal ,  IIT ROORKEE,  NIT hamirpur,  jalandhar, trichy, NIT rourkela, NIT Surat,  NIT allahabad

These are some possible college based on your gate score.

Hope it helps