my gate 2019 score is 512 . which are the colleges that i can apply?

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

National Institute of Technology Sikkim Department of Electrical & Electronics Engineering Electrical Engineering (Specialization in Control Power and Electric Drives)

National Institute of Technology Meghalaya Department of Electrical Engineering Power & Energy Systems

Sant Longowal Institute of Engineering and Technology Department of Electrical & Instrumentation Engineering Instrumentation & Control Engineering

National Institute of Technology Srinagar Department of Electrical Engineering Electrical Power and Energy System

National Institute of Technology Agartala Department of Electrical Engineering Integrated Energy System

National Institute of Technology Srinagar Department of Electronics & Communication Engineering Communication & Information Technology

National Institute of Technology Srinagar Department of Electronics & Communication Engineering Microelectronics

National Institute of Technology Manipur Department of Electrical Engineering Power System and Control System

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