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You need to secure a rank around 3000 or less if you belong to home state inorder to get seat in NIT Sinchar for ECEbranch for SC category or if you belong to other state state you need to score a rank around 2000 for ECE branch for SC category so to say in terms of marks so, as you belong to SC category inorder to get a rank around 2000 you need to secure atleast 110+ marks.

Visit the below mentioned link to know about the cutoff trends of NIT silchar

https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-silchar