Hi aspirant, since you have 12697 rank in SC category so based on that you can only have lowermost NIT institutions and those some NIT's are mentioned below;

• National Intitute of Technology, Meghalaya
• National Institute of Technology, Shillong
• National Institute of Technology, Agartala
• National Institute of Technology, Imphal
• National Institute of Technology, South Sikkim
• National Institute of Technology, Goa
• National Institute of Technology, Srinagar

Etc.

Good Luck.