If anyone can answer this, I would truly appreciate it. So if I miss the deadline to apply for college and I reapply next year, is there a chance that they are going to check my second semester high school grades?
Deadline for Fall 2017 application? Are you planning to take a Gap Year then?
When you apply you will presumably send them your transcript, which contains your entire high school record. So the answer to that is most definitely yes. Also I don’t see why you would miss the college deadline, you have an entire month left and most colleges allow you to submit the application even a couple of days late
Yes
So if you take a Gap Year, all your grades 9-12th will be on your HS transcript, so Senior grades will be considered.