Students Worldwide Are Learning How To Excel In School From

Today, children are expected to earn high grades in all of their
classes, in spite of the failing public school system. Parents
can still remember when an education was essential in preparing
children for their livelihood.

Now what many public school systems offer is overcrowded
classrooms. Teachers are being grossly underpaid for their
skills and overworked. Outdated learning material, metal
detectors, violence, [...]

Why is there a decrease in the number of students enrolling for Computer Science courses worldwide?

This is true for the US and Europe but may or may not be true in other places