I am poor in math, physics and English in Grade Two. Can I make up for it myself in a month or so during the summer vacation? Can you improve math and physics in a month? It's self-study, but
That's ok, but you can't always succeed in a month. Learning is a habit. If you don't work hard for a month, you don't have to do it later. If you want to constantly improve your study, you must stick to it, not for a month or two, but for a month. You can improve your junior high school things immediately, but sooner or later you can't keep up.