Physics junior high school is very different from high school.
Maybe you will find it very simple in junior high school, but in fact, physics learned in advance in junior high school is almost useless.
In senior high school, the rigor, accuracy and authenticity of physics subjects (especially competitions) are particularly important.
Be very patient and calm when you do the problem. Only in this way can we really see whether you are suitable for studying physics.
Of course, your own feelings about physics must be different. Let it be.