The same thought I had a year ago when I entered in XII standard.
The XII marks are important for taking admission in the college on the merit basis or fulfilling some eligibility criteria for the Entrance Exam…
Now I came back to your question.
The answer is being consistent towards your study and gives your 100% into it and then see everything you wish fall into place.
Now I will tell my experienced to give you a clear cut reality.
I passed my XII standard in 2019 with 95 % (BO4 ). I want to opt for humanities but I didn’t take that and take commerce stream with a hope that will learn new subjects.
But somewhere I always feel bad that I didn’t take Arts but finally I made up my mind that what I got I will excel in that.