You still get a timetable, but no-one checks if you attend things. Your lecturs in first year will often be huge, and your lecturer won't know the students personally.
You'll have a personal tutor, but you have to go to them if you need help, they won't "keep track" of you.
You'll get assignments. Most will count towards your final grade. No-one will remind you to hand them in on time, and no-one will chase you up if you're late, you just fail. If you need help, then you make an appointment with the lecturer who set the assignment via email. You'll get the chance to collect your work once it's marked and get written feedback. Again, you can make an appointment to discuss this with whoever marked your work if there's something you're unsure of.
Basically, unlike at 6thform, you're considered mature enough to organise your own time, and seek out any help you need. There is help there, but you have to ask for it. No-one will be cross with you for not understanding, but they will be unsympathetic if you fail unless you have genuine extenuating circumstances.