Differences between British and American English: class
In both the UK and the US, a class is usually a group of students who are learning together: Jill and I were in the same class at primary school. You can also (especially in the US) use class to mean a group of students who all completed their studies in a particular year: Tim was in the class of 2005. Class can also mean a series of lessons in a particular subject: She’s taking a class in business administration. The usual British word for this is course: a course in business administration. Class can also mean one of the periods in the school day when a group of students are taught: What time is your next class? British speakers also use lesson for this meaning, but American speakers do not.