No, since you have passed all your subjects, there likely won't be any subject replacement in this scenario. Subject replacement policies typically come into play when a student fails a subject.

You have passed all six subjects, fulfilling the basic requirement to move on to the next grade.
There is no mention of a policy that replaces a subject with the one you scored highest in for promotion to the next class.

https://school.careers360.com/boards/msbshse/maharashtra-state-board-10th-marathi-books-bsar

I hope it helps!