1. Key math classes: Key math classes are a highlight of science at Xigong University, the most famous of which is the key math classes at the School of Mathematical Sciences. Key mathematics classes mainly train talents in mathematics, including basic mathematics courses, advanced mathematics, mathematical analysis, abstract algebra, calculus and so on. These courses are very important basic knowledge of mathematics, which can help students lay a good foundation for mathematics and lay a solid foundation for future research in various fields related to mathematics.

2. Key physics classes: The key physics classes of Xigong University mainly include the key physics classes of the Department of Physics and the key physics classes of the College of Materials Science and Engineering. The curriculum of key physics classes includes basic physics courses, quantum mechanics, electrodynamics, thermodynamics, optics and so on. These courses are all important knowledge of physics, which can help students lay a good foundation of physics and prepare for future research in various physics-related fields.

3. Key chemical classes: The key chemical classes of Xigong University mainly include the key chemical classes of School of Chemistry and Environment and the key chemical classes of School of Materials Science and Engineering. The courses of key chemistry classes include basic chemistry courses, organic chemistry, inorganic chemistry, analytical chemistry and so on. These courses are all important knowledge of chemistry, which can help students lay a good foundation of chemistry and prepare for future research in various chemical-related fields.

In a word, the key science classes of Xigong University cover mathematics, physics and chemistry. Students can choose the key courses that suit them according to their interests and specialties, lay a solid professional foundation and prepare for future research in related fields.