Hello Rahul,

Well with your JEE Main percentile you can get government colleges. To get colleges like NITs,IIITs,GFTIs you have to first clear the required cutoff according to your category. For SC candidate the 2019 JEE Main cutoff was 54.01 percentile, where you got  80 perecntile. So you are JEE Main qualified and eligible to get a good college. Now for admission into NITs,IIITs or GFTIs you have to go through JoSAA counselling process. You may be able to get seats in the first few rounds of JoSAA. If by any chance you don't get a seat through JoSAA, then you can apply for CSAB counselling through which you will be able to get a seat in NITs,IIITs,GFTIs,SFTIs. CSAB counselling will start after JoSAA counselling is over.

You can visit this link and check the details about JoSAA counselling : https://engineering.careers360.com/articles/josaa-counselling

Also, visit this link and check the detailed information regarding CSAB counselling : https://engineering.careers360.com/articles/csab

On the other hand, if you want seat in other government colleges that accept JEE Main score but doesn't participate in JoSAA , for those colleges you have to attend their respective counselling session. Below I have listed some of the government colleges that accept JEE Main score, other than NITs,IIITs or GFTIs - 

• Delhi Technological University
• Jadavpur University
• Maharaja Sayajirao university of Baroda
• Punjab Engineering College
• Harcourt Butler Technical University
• YMCA University of Science and Technology
• Chandigarh College of Engineering
• Graphic Era University
• Institute of Engineering and Management
• Vasavi College of Engineering
• MIT Academy of Engineering
• Bangalore University
• Manipal University
• Amrita School of Engineering

So these are some of the colleges those who accept JEE Main score. You can go through this link and checkout the list of  colleges accepting JEE Main score : https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-India

Hope that you get your choice of college. Good Luck !!!!