For your present grades, it is of course the best to study harder, but to tell the truth, what you left behind in Grade One can't be made up at once. The process of making up lessons is painful and boring, which requires incomparable perseverance and determination. Therefore, I don't really suggest that you choose the road of Daimonji to cope with the college entrance examination. In my opinion, you'd better choose a favorite and talented major and study with it. If you can keep your present grades and learn your major well, you will be admitted to a good university ~ ~! Let's cheer together ~ ~!
By the way, where are you from? I come from Shandong and want to make friends?