by qualification of CGPET , but not jee mains, can I get NIT raipur?

No for any NIT you have to give JEE MAINS  and also
NIMCET ,

It is a great choice but it is necessary to have 1 to 90050 rank in your JEE MAINS exam.

And also have 75 % up in 10 +2 mark sheet.

In NIT Raipur - National Institute of Technology

The course cutoff are

B.Tech Biomedical Engineering

20196 - 8849 Closing rank

B.Tech Biotechnology Engineering

2019 - 60203 Closing rank

B.Tech Chemical Engineering

2019 - 42041 Closing rank

B.Tech Civil Engineering

2019 - 45345 Closing rank

B.Tech Computer Science and Engineering

2019 - 16245 Closing rank

B.Tech Electrical Engineering

2019 - 26730 Closing rank

B.Tech Electronics and Communication Engineering

2019 - 22835 Closing rank

B.Tech Information Technology

2019 - 22351 Closing rank

B.Tech Mechanical Engineering

2019 - 42756 Closing rank

B.Tech Metallurgical and Materials Engineering

2019 - 64537 Closing rank

B.Tech Mining Engineering

2019 - 79205 Closing rank

For kore information about placement you can visit this link

https://www.careers360.com/university/national-institute-of-technology-raipur

Thank you. I hope this answer helps you.