Not so good. According to the inquiry, the institutions in Niu Wa to help students enter higher schools are not reliable, because most of the topics in them are copied from the workbooks of major supplementary books, and some of them just change a few numbers, which are highly repetitive and have no gold content, so the institutions in Niu Wa, Changsha to help students enter higher schools are not good. Changsha is one of the first national historical and cultural cities. After three thousand years, its name and address remain unchanged, and it is known as the hometown of Qujia, the famous city of Chu and Han, and Xiaoxiang bamboo silk.