Hi pal,

The cutoff varies every year. It depends on the stream or course you want to choose. But generally for the general category one should score 80+ % in order to get admission in the Fergusson College. Reserved category students (SC, ST, OBC, NT, SBC) can get admission on 70+ %.
For securing admission in Fergusson College for FYBA in the first merit list one should score at least 90%.
If one has 90% in HSC he is likely to get admission in Fergusson college.

Hope this will help you.

Good luck.