English cannot be improved in a short time. You need to take your time, recite grammar and read composition every day. After a long time, your score will naturally go up. You should still have about three months to enter the college entrance examination. As long as you persist, you will definitely make progress.
I think it is a big problem that I can't finish writing a comprehensive essay, so I need to practice more now and practice the speed of answering questions. You must ensure that you can get points for your writing. I suggest you practice an identical comprehensive article, which is more difficult. Just practice the college entrance examination. Attention, you must take out a whole block of time to finish the comprehensive paper at one time, otherwise you will not adapt to the college entrance examination.