I am doing BSc at Monash.
I did Chemistry, Physics, Maths and Astronomy (most people have Bio in there, most popular subject)
All of the courses were decent, very engaging. Of course, there will be boring bits that you don't enjoy.
The lecturers depend. In every 10 lecturers, there's usually 2 that are amazing, 6 that are average and 2 that are bad.
How are the other students? They are okay. There's the people who want to excel. There's the average person. Then there's the people who barely want to pass. Getting those on your team for group-work like labs is no fun. Usually, people are more lax at uni than you'd see students in VCE
Class sizes.
You have lectures. These seat a lot of people. Depends on the subject, can be anywhere from 100 to 300 people, maybe even more, I'm not sure (Biology has massive ones)
Lectures are optional. Attending them is a good idea however, but some people learn differently. A friend of mine didn't attend a single lecture, but obtained 3 High Distinctions. (He is a mature aged student and a studious person, however)
Then you have labs (chemistry, physics, etc) or tutorials (maths) which are much smaller, maybe 15-20 people
For most subjects, labs need to be passed to pass the whole subject
In labs, you do...lab work

Usually, it relates to the course (somehow)
In math tutes, you answer math problems (attendance is usually optional) However, tutorials are VERY helpful
Timetabling. I had 22 contact hours per week this year for both semesters. Naturally, this depends on what subjects you choose. Physics, chemistry and biology are usually 6+ hours per week, the maths are usually 5. It is very hard to get a day off in Science. And I don't recommend squeezing everything in as well, unless you really need to (for travel, job, etc reasons)
Squeezing usually results in tiredness and lack of concentration. And not enough break time to socialise with other people!
Overall, the environment is great

Plenty of open space, plenty of grass to sit on. A bustling campus centre. Helpful tutors and staff. Only thing I dislike is that it is so far from the city (and my house)
Otherwise, go for it
