you can still get into national institutes of technology bit they wont be the 1st or 2nd tier. You can aim for the 3rd tier NITs which are not so bad either. But if you have given any other entrance exam, keep your options open. 

You can try the following north east nits

Nit sikkim

Nit mizoram

Nit arunachal pradesh 

Etc

They have a closing rank of around 50k-70k