Yes Infact report says that 50 percent of the students studying in IITs are never went to any coaching even IIT council is trying to reduce the influence of coaching institute without joining coaching you will enhance your raw intelligence and you can device your own methodology to learn and solve problems with more permanence. Therefore if you are preparing on your own then with gpog strategy you can crack it.

Please go through the following link it will be helpful.

https://www.google.com/amp/s/engineering.careers360.com/articles/how-crack-jee-main-2019/amp

All the best