hello there,

since your category is ST, the minimum marks required in jee mains according to the cut off of last year to get admission in GaUHATI UNIVERSITY is 39.80 . the cut off for this year is predicted to be 40 -45 for ST category.

the other eligibilty criteria for taking admission in gauhati university is :-

Class 12 with 45% aggregate in PCM/B + JEE Main  or Assam CEE

you can also predict your rank by checking here :

hope this helps!