Ask yourself first, is English+math+politics good? You should know whether six months is enough. You know CET-6, and postgraduate English is equivalent to CET-7 and a half. Mathematics is a bit abnormal, and you can see the score line every year. Anyway, when I took the exam, the perfect score was 100 and the score was 40. Politics should not be difficult. Read a book and understand the textbook, just 70 points.
But are you sure you can finish these three courses in six months?
Look at your own ideas, you have no confidence in the postgraduate entrance examination. If I advised you to give up, you wouldn't decide to take the exam from your heart.
In fact, if the postgraduate entrance examination can persist until the end, it can be admitted.
I wish you success!