Mining, Metallurgy and Mechanical are the oldest and best branches at NIT Raipur.
I can understand how motivated you feel right now. At this phase of your life, you must be confident that a year’s preparation will land you in a better place. Surely, this can happen with dedication and hardwork. However, many students fall into depression and anxiety a few months after taking a drop year. This affects their performance which can lead to lower scores in the second attempt.
I suggest you take admission into the Mining branch of NIT Raipur and prepare for your JEE Mains side by side. This will require time management and discipline from your side. But you’ll always have your ongoing degree to fall back to, in case things don’t work out. Rest assured that the Mining branch at NIT Raipur is a good option.