Charley entered Professor Truebridge's classroom, and was in an instant just as nervous as she had been before Potions or more. The classroom was very comfortable-looking, but there were tables instead of individual desks, meaning that she was going to have to sit next to people. It's not that she didn't like other people- she often did- but she didn't like to make many assumptions about people, so she never knew what someone was going to be like, a prospect which was thoroughly frightening. She saw that there was only one person sitting at the table closest to the bookshelf, and they were at one end, so she decided to sit there.
This is what I get for being late. I was so foolish to assume that Nathaniel would actually do something nice for me.
She weaved through the other tables, which were placed, seemingly randomly, around the fascinating room, and took a seat at the other end of the table. She saw that most of the other students had grabbed safety tools already and were practising chants, and suddenly felt clueless. She usually was the top student in her classes, but she had no idea what was going on.

ooc: I edited the post, but didn't change any of the facts; I just added a thought and corrected a couple grammar mistakes.