There is no such specific cut off for B.Tech admissions in GBU . There is a written test that you need to clear before procuring any of the B.Tech courses. The cutoff rank keeps on fluctuating every year , but for a rough estimate , if your rank is under 200 then you can easily get courses like CS , ECE , IT etc .

As per the rank that you have specified i.e AIR 99 , you will easily get the CS course in GBU .

All the best !