Hi , 

So admission is calculated by taking an average of PCM marks and HSC percentage.  An exact official cutoff isnt provided but in 2018 the candidate with the highest score in gulf quota had 293 marks in PCM and 94.25 % in HSC and so the eligibility percentage was 97.67%. The candidate with the lowest score in this quota had 132 marks in PCM and 54% in HSC and so the eligibility percentage was 53.17% . There are just 86 seats in total in the whole quota and the competition is high . You can understand stand that PCM score as low as 132 was accepted.  You might have realized the range of scores .

The CS cutoffs are provided here . 

For detailed information check this link. 

https://engineering.careers360.com/articles/coep-cutoff

Hope this was helpful. 

For further queries please approach careers360.