I remember being in maths class with a kid next to me who was a maths wiz. He could see what I was doing, was available to help almost the whole lesson, far easier for me to ask then the teacher who had many other students.

In theory a much faster rise to mastery. In practice I rarely had to actually do the work because he'd help me if I got stuck, and what made sense when he explained it didn't stick because I wasn't really doing it.

I did very badly in my first test that year, and was moved elsewhere.