There are about 60 students every year in College of Physics, School of Science and Engineering, except for the first year. 15 students among those 60 are entering School of Comprehensive Studies for the first year. Then, they will join College of Physics at the second year.
Visit the top page of University of Tsukuba: https://www.tsukuba.ac.jp/en/. Click on “ADMISSIONS” for more details.
Latest information on the admission (in Japanese): https://www.tsukuba.ac.jp/admission/