Dubbing will be more better. If you are preparing for an entrance exam.As per my consult.
But make sure that you didn't avoid your boards and pattern of writing exams and answering questions.
If you study with hard work you can learn the board pattern easily in the end.
In board you can not apply direct formulas and law.
So I suggest you to go with dubbing school.
At last is your decision if you can manage your time and study you can go with regular schooling also. Is all depends upon you.
Good luck.