I've been meeting all the three words (class, form, grade) related to schooling, but I can't get my head around the differences. Please could you explain the differences? I need to know which one of them means a group of young people of about the same age who study at school together in the same classroom during one school year.
Here are some examples:
"There are several parallel classes in ordinary schools, but we had only five classes in total."; "We studied in class".
"She studies in the second form"
"He is in the second grade"