Ape question bank has many free questions, supports a variety of test paper exercises and professional analysis counseling, and can practice for free.
Onion Mathematics provides many videos of science courses, many of which are free. Although some of them are paid, free is enough.
In addition, there is a superstar learning link, through which users can self-help complete library book borrowing and querying, electronic resource searching and downloading, library information browsing, school curriculum learning and group discussion.
There is also a master of Chinese studies. This app contains a complete modern Chinese dictionary and ancient Chinese dictionary, more than 5 million words, and ancient poems in primary and secondary schools. Support a variety of search modes, you can take words manually or by taking photos, and also support offline query, which is convenient for learning anytime and anywhere.
Generally speaking, these softwares are good helpers in high school study, but which one to choose depends on your own needs and actual situation.