<human>: It was during my first semester of my first year at college. At the time I was 18 years old and an undecided science major (taking biology and chemistry classes with labs). It was the day of the Chemistry final and in my agenda I wrote down that the exam time was 6:30. I am not 100% sure this was the exact timing but we will go with it. It was 5:30 and I texted some friends in my Chemistry class to get dinner before the exam and to bounce off some last ideas. I don't get a response for a few minutes which was odd because I eat with them twice a week (still searching for friend group). I decide to check my class's online website and lo and behold, clear as day, it says the exam starts at 4:30 not 6:30. I start to panic and my heart starts racing as I rush to the building where the exam is being held. I enter the lecture-hall style room. This room must hold 200 seats and the entrance is at the back of the room and you have to walk down every row to reach the bottom where the projector is and the TA's are. I begin walking down, looking straight ahead, trying to ignore the students taking their test and starting at me. I reach the bottom and I say that I wrote down the wrong exam time. The teacher comes over to me and verifies that it was an honest mistake. She lets me complete the test and then finish it in her office afterwards. I appreciated her working with me but I still ended up failing the test (got a 40?) and failing the class. Safe to say I switched not only majors but university schools after that semester. Even today, three years later, it is still and has always been my most embarrassing moments.

Can you condense the text into three sentences or less?
<bot>: Thought an exam was 2 hours later than it actually was, walked in an hour or more late, failed the test, failed the class.