As per your score and previous year cutoff, the colleges you get in first round are:-

IIT Bombay  Aerospace Engineering      Dynamics and Control      

IIT Kharagpur         Aerospace Engineering      Aerospace Engineering     

IIT Madras    Aerospace Engineering      Aerospace Engineering

To know more about your chances of getting other colleges check out the PSU/college predictor link below:

https://engineering.careers360.com/gate-college-predictor

 

Hey Siddharth!
Gate score for iit's - 
Iit's cutoff for gate is the minimum score required for admission into mtech programmes across various iit's. Candidates who scored equal marks or more than cutoff of marks of gate iit's will be considered for admission into mtech programmes.
In the link below there is a list of the iit cutoff for gate - 
https://engineering.careers360.com/articles/gate-cutoff-for-iits
The other colleges preferebly iitd, iitm,iitk,iitkgp,nitie the cutoff includes - 
General - 750+
Obc- 650+
Sc- 400+
St - 350+
The other mtech colleges include - 
Anna University 
Bits pilani
Cochin university of science and technology
College of engineering trivandrum
Delhi college of engineering
Delhi technical university
Gautam buddha technical university
Sv college of engineering 
Wish you all the best!