How can I attract more students?

As it stands now, I only have on average 750 students per day, and my population is 60,000.

How do I get more students to enrol?

I have bus stops EVERYWHERE, and the average waiting time is 21 minutes.

First, the "population" number at the bottom of the screen gets exaggerated after it reaches 500. Stop looking at it to reason about the agents of the game. Instead, look at population -> details (-> students).

The number of students is determined by the number of each kind of residential building.

§  Low  (1x2)    4w   2sh   2st
§  Mid  (1x4)   40w  20sh  15st
§  Mid  (2x4)   40w  20sh  15st
§ High  (4x4)  400w 200sh 100st   <-- best but heavy traffic

§§  Low (1x2)    2w   1sh    2st
§§  Mid (4x4)   20w  10sh   10st
§§ High  (4x4) 200w 100sh   50st    <-- second best

§§§ Low  (4x2)   2w   1sh    1st
§§§ Mid  (4x4)   7w   3sh    4st
§§§ High (4x4)  70w  33sh   30st  <-- super easy mode

From this list, you can see that Poor, High density has the most students per building. It's also the hardest traffic generator by double. If you can stand the traffic, go for it... otherwise go for MiddleClass, High density.

If you want more students, the best way to do this is to increase your low income housing population. You can do this with new zones in low land value areas, or increase the happiness of current low income housing neighborhoods so that their density increases (be sure to upgrade roads where appropriate).

The reason low income housing should be the focus, is that unlike some mid-wealth sims and many high-wealth sims, their populace will not move in already "educated." Couple this with the fact that low income housing packs in the most population density per building, and this is the easiest way to gain more students.