But if you want to go to the north campus, you can take the 13 bus and get off at the south campus. Go along the slope and there will be a school bus for HKUST. 1 yuan can go to the north campus!
If you want to see the city, you need to take the 1 bus from Xiangtan Railway Station, get off at Jijiying Station, and then take the 14 bus from Jijiying Bus Station. The terminal is at the gate of the north campus of Hunan University of Science and Technology.
Then if you go back to Wuchang from Hunan University of Science and Technology, it is actually very convenient. You can take the same train back to Wuchang, or you can take bus 14 from Hunan University of Science and Technology, get off at Xiangtan coach station, and then take Xiangtan-Wuhan coach. There are three buses every day, two in the morning and one in the afternoon, and the whole journey takes the Beijing-Zhuhai Expressway.