I have a video called How To Study.
But getting straight As is the wrong objective. Your objective should be to deeply learn and master life. Grades are dumb. No one will give you a grade for mastering life.

No!
Yes, there are millions of artists, but most of them suck. If you truly created great art you would not have any problem surviving. The issue is that great art is extremely difficult to get right. And it's not a problem of lack of technical drawing skills, it's a problem of vision, execution of that vision, and taste.
The majority of films, video games, novels, songs, etc are bad art.
As an example, a truly great video game comes out once every few years at best. There is an enormous market for such video games. The supply cannot meet the demand. If only such games were easy to make.
If you make something amazing, people will flock to you and even adore you. But you cannot achieve this amazingness via narrow technical skill. It's important for you guys to grasp that art is primarily about vision. The rest is niggly details.