Scientist and science educator Sten Odenwald at NASA’s Goddard Space Flight Center has written and published about 700 calculation problems for use in education relating to space science. They cover all kinds of topics relating to astronomy, planetary science and space engineering, with exoplanet exploration among them. The difficulty level reaches from basic arithmetic and fractions to entry-level university maths. Each set of problems contain a seperate answer key with detailed working out. The problem sets also feature recommended school grades.
The collection is a useful resource for educators trying to practice the mathematical principles of space exploration.
Find the complete collection here. The astrobiology-subsection specifically contains a large number of exoplanet-related problems.