Physics: @ CEO Yu, he is a physics teacher and an eighth-grade physics teacher, but you should read the advice of the first volume of the ninth grade and review the senior high school entrance examination.

@ Teacher Martin? Really, really, really good, and the remedy effect is not high. With the mentality of giving it a try, I searched everywhere and asked Mr. Ma to accept my knee. Not only good, but also complete. The key is that junior high school is free. A class lasts one or two hours. There are handouts prepared by the teacher in class and homework after class (all free). Talk and practice, the effect is watertight!

Chemistry:? Teacher @ Fan Qingping is worth recommending. It seems to be a teacher in Beijing No.4 Middle School. She recorded some video lessons in the elite class. Although the video was shot nearly ten years ago, it still has guiding significance for junior high school chemistry today, because the particularity of chemistry discipline lies in the fact that there has not been much breakthrough in the field of basic chemistry since 100, and the real-time performance is not strong. The types of topics more than ten years ago are still similar to today.

The characteristic of this course is that it has the advantages of traditional classroom. Compared with all kinds of online courses now, they are rich in content and detailed in explanation, so students at any stage of grade three can clearly find what they need to choose.

Other courses on the internet are very shallow, and basically repeat the contents of the book. This is because of the fast pace of the contemporary Internet. On the one hand, those teachers have their own profit needs and will not upload all the content.

In terms of scope, the free content that can be found on the platform is either fragmented classes and videos, or simply put the key content on other paid platforms. Only this video series is exactly the same from the preface, which is extremely conscience compared with other resources.