Anecdote: 34 out of 36 aspiring engineers, eventually dropped out....

I recently heard this. 34 out of 36 aspiring engineering students dropped out of the program.



My questions is WHY?



What do you think the common reasons are, that make people drop out? in your experiences. Of course the average dropout rate(So I've heard) is around 60-80%



I'd like to know the pitfalls and situation better so that I can mentally prepare myself to a greater extent.



Thanks.