The same goes for college.

I've advised college students to leave their laptops in their dorm room. Take a spiral notebook to lecture, and a couple pens. Write down everything the professor writes on the chalkboard.

When studying, going over the notes, you'll hear the lecture again in your head.

Of course, if the professor doesn't use a chalkboard, and does a slide presentation instead, that will make studying harder for you.

The best presentation I ever gave was when the presenter didn't show up, and the conference asked for volunteers. I volunteered and gave an impromptu presentation using markers and the big whiteboard. The back-and-forth with the audience was very productive!

Most conferences have no way to do this. I tried using an overhead projector and markers, but the conference people thought I was crazy. There was just too much expectation of a packaged slide presentation.