Hi, Rohan 

Aec, Jec and jist are the most prominent Engineering colleges in assam. 

To be able to qualify for that the minimum marks that are required to get the admissions into these colleges varies between 110 to 125 for a few years

In aec, for general category students has to get  110 marks 

In jec , it is 107

In jist, it is 104

As your rank suggests your marks will be between 100 and 120, so you'll definitely get into jec, just or aec. 

Goodluck