Cultivate interest
First of all, you should cultivate your interest in politics.
Read more news and materials.
Watch more news, and there are some books and materials about political facts.
Do more exercises.
Do more questions and cultivate your ability to answer questions. Anyway, high school politics sometimes has some calculation problems, so you should learn math well.
organizing ability
If you have strong organizational skills, it can also help you organize your political issues to some extent.
Knowledge accumulation
Good China politics is not necessarily good. Although these two courses belong to liberal arts, Chinese requires knowledge accumulation, and politics sometimes requires you to be close to life and add political or economic views to answer.