Of course, there are also tricky methods. For example, you only need to spend 30 minutes learning the algorithm of vector (the one with coordinates), then find a book for general review of mathematics, turn to the part of solid geometry, and learn the chapter on the use of space vector directly. Look at it for two hours at most, and you can basically do the big questions in the solid geometry part of high school mathematics.
Of course, you still can't do the fill-in-the-blank and multiple-choice questions of solid geometry.
By the way, are you majoring in arts or science? If it is science, chemistry is the protagonist in these two months, because the review materials of chemistry basically cover three years. If the foundation is not good, it will be difficult to understand after school starts.