Dear Rishab,

you scored very good ranking in Gujcet 2018 exam(rank-86 + 12th - 91).with this marks your chances are there to get a seat into any government colleges as well as a private institution in Gujarat.some of colleges are you will get:
PDPU Gandhinagar, GEC Patan, GEC modsa, LD institute Ahmedabad etc.

for more info check it out previous year cutoff rankings:
https://engineering.careers360.com/articles/gujcet-cutoff

good  luck