When I enter the senior year, the course is about to come to an end. I will try my best to complete the credits needed for my career so that I can graduate successfully.
When I am a senior, the course is coming to an end. I will try my best to finish the credits needed for graduation, so that I can graduate smoothly.<br>
When I was a senior, the course was coming to an end, and I would try my best to finish the credits required for graduation, so that I could graduate smoothly.