The main reason is that there will be contradictions in putting junior high school knowledge into senior high school.

For example, in junior high school, the angle is 0~ 180. If it is greater than this, it is not an angle.

In high school, the angles can be superimposed by one circle, two circles and n circles.

In junior high school, Sina = 1/2 was 30 degrees.

In high school, it was expressed in radian system, that is, one-third π.

And the answer should be a=(π/3)+2kπ, and the most important (k∈Z) should be added at the end, and none of them will be scored.

So don't be too nervous, just have the right pressure and try to adapt to the new learning environment. After all, everyone is admitted to school, and their grades will not be as bad as junior high school. You are strong, others are strong. If you want to stand out in that field, you can't do it unless you make time to study alone.

What about the solution?

Math is very simple. I'll give you eight words "sea tactics, sea tactics". The edge of the sword comes from sharpening, and the fragrance of plum blossoms comes from bitter cold.

Doing more questions can quickly adjust our thinking and expand the limitations of the original junior high school. I recommend you to use this book. Its title is classic and the answer is nearby. Detailed and massive questions can make you quickly adapt to the new high school life.

This is what every high school student has to go through. It's not that the junior high school level is not high, but that the learning ability is limited, and people's intelligence will gradually develop with the body. However, primary school, junior high school, senior high school and university are just a place for us to exercise our learning ability. For example, high school chemistry requires memorizing many chemical formulas and balancing them, but once a university chooses a subject, it may not be able to balance the chemical equations for the rest of its life. This is the blind spot of education in China. But we misunderstood his original intention. We just need a platform to exercise our learning ability, so we go to primary school, junior high school, senior high school and university, not because we need to use all the knowledge in it for future development, but only where we can exercise our learning ability.

So don't lose heart, learn the rest of the subjects as soon as possible, come on.