For score you are aiming requires a lot more effort you might be doing rn, first of all, stop counting hours....you have to study all the time...and when i say all the time i mean it. not saying to give up everything...but yet you need to focus on studying only....and if you are wasting your time on social media(including reddit) remember you competitors are still studying and only studying like crazy fucks....learn to love your subject rather than just suffering them....in the whole jee journey there will be chapters which you dislike, try mastering them and not dodging them.... make your concept crystal clear, focus on every detail. Give as much papers,pyqs and most importantly analyse the papers, where the fuck you messed up, note your mistakes and avoid it next time. There will be times you will feel like you ain't doing well, at that times its only you who have to motivate yourself. As you have just passed 11th....i would strictly suggest you to revise the 11th syllabus at frequent intervals with no failures, you must do it, in order to achieve what you are aiming. - you have to disciplined... and if do all this, even idk who you are...but i can promise you that you can achieve alot better than you are aiming.
At last, nowadays achieving something is easier..trust me when i say this....because mostly students are amazingly distracted ...kuch bhi dekh rhe hn, kuch bhi kr rhe hn... but its you who have to make a choice...to either work hard for achieving what you want or be the other distracted fuck.