How many courses for everyone take for MENG?

This is my first term in the master's program, and I was planning to take 4 courses, the same as in my undergraduate program. But I just realized something: for these 4 courses, they are all "major courses", in other words, they are all quite important and have a significant amount of workload (my pace of the undergraduate degree is similar to "3 major courses + 1 course for chill"), which makes me have some thoughts to drop one of the courses (Actually I was catching the deadline of an assignment of one of the course which make me absence for a lecture of another course at Monday night).