I'm a science student in senior three, and every time I take a monthly math exam, I'm always in a mess. I have hardly done the following questions correctly. Good people should give me some advice on how to practice. The exam will not test the questions you have done. Analyze the meaning of the question and solve it with what you have learned.

The first problem is solved by method of substitution.

The second problem is obtained by making g(x)=-f(-x).

The third problem is solved according to the monotonicity of quadratic function, the position of symmetry axis and the distribution interval of X.

This is the most basic idea when you see this topic. You don't have any of these, and it's no use telling you the answer, because you won't think of other topics next time.

You should cultivate your ability to analyze and solve problems independently. From this perspective, you don't have these basic abilities at all.