* "The midsemester break gave students a much-needed chance to recharge before the final push."
* "Our midsemester exams are scheduled for next week."
* "She decided to drop the course after a disappointing midsemester grade."
* "The professor will be holding a midsemester review session to cover the material so far."
* "The midsemester project is a significant part of the overall course grade."
You can also use "midsemester" as an adjective:
* "We're currently in the midsemester period."
* "The midsemester break is a welcome respite from the hectic academic schedule."