Yes, most people ( i would say that around 120/160 if not more at my school) do at least two forms of tutoring. I know at least 70 students attend tutor for 4U math, 3U math and chemistry. Most of the tutoring is from coaching collages. I myself do 4U/3U at dr du and chem and phys at ace/matrix so i have only ever really been to coaching colleges. I personally just really like the environment at both places and found them ideal for my type of learning. Also in all my classes i was constantly surrounded by extremely high performing students which made me try harder at those subjects as well. A con would be that these coaching colleges are $$$$. Easily most of us pay around 4-5k a term for just tutor (and this is just for 3 subjects, people do more), i know its insane.
I know a couple students who do private tutoring for english and they really enjoy it. I guess the biggest pro to this would be that you get 1:1 teaching which alot of students benefit from. Closer relationships to teachers which makes for maybe a more comfortable experience too. I'm also guessing its alot cheaper.