If you only have one month's study time, I suggest that you spend 10 days copying Sketch of Structural Still Life, and then draw the structure after the exam, even if there is no obvious tone, it is enough to cope. It takes 15 days to copy colors and 5 days to sketch. The method of copying for a long time is not very good, but because you only have one month, if you don't have the teacher's guidance, you can't find the feeling by practicing sketching every day. So you can only learn those basic skills by copying.
The art classes offered by Gaopu are not very demanding on majors, so you don't have to have too much pressure. Generally, students in the art class in Gaopu can pass the major relatively, so you should mainly improve your cultural achievements.