But it's the second half of the year, so you'd better ask whether the company requires you to practice with them before graduation, at least the latest deadline will not conflict with your postgraduate entrance examination time. It's best to see if we can discuss it and go to the company after graduation. So as not to embarrass yourself.
As for the impact you said, don't worry at all. If you want to talk about the impact, it will help you prepare for the exam with more peace of mind. When you pass the exam, even if you have to run a few more times to break the contract, it's nothing.