There was a mentoring programme when I was in Temasek Polytechnic studying Biotechnology.

Senior students were matched with their juniors, who could seek their help in understanding difficult subject concepts.

The programme was meant to benefit both the juniors and the seniors (and, I suppose indirectly, the lecturers as well).

As one of my lecturers put it,

"If you cannot explain your subject to someone else, you don't know it well enough."