It should be graduation project. Because you need to write a thesis for your degree defense, and you can only apply for an undergraduate or a master's degree, there is no degree in a junior college, only a diploma without a degree certificate, so you don't need to write a thesis when you graduate from a junior college. Moreover, college graduates pay more attention to practical courses.

The second half of junior year is from March to June every year.

Usually, the preparation starts from March to May. Graduation thesis is the last step for freshmen to leave colleges and universities. Only when the repetition rate of the paper reaches the standard can they reply and finally graduate smoothly and get the diploma.