Hi aspirant

If you are from OPEN/OBC category then you won't be able to get but still if you want you can apply for it .There is 1% chance that you may get.

For a CS student score just 503 is too less .But you can apply for IITs and NITs .You posses a fair chance there.

Visit the link below to check the cut off for CS in all domains.

https://engineering.careers360.com/articles/gate-cutoff-for-iisc-bangalore

You must be well aware that MS/PHD courses are much more elaborative.Though the cut off for MS and PHD are slightly low than Mtech but the interview process much more than that.

Visit the link to check the cut off of IITs/NITs:

https://engineering.careers360.com/articles/gate-cutoff-for-iits

https://engineering.careers360.com/articles/gate-cutoff-for-nits

Visit the link to predict the colleges you might get:

https://engineering.careers360.com/gate-college-predictor?icn=GATE-clgpd&ici=clevertap-exit-intent

Copy and paste the links in new tab to open

Hope this was helpful.All the best.