I have been wondering about this. Many computer training schools just take your money and teach you just 1/10 of the course or they don't even come foe lectures till you get fed up and leave. Why??

Looks like its time to switch to a different training school sir.

All I tried end up being useless

There's some truth in what you have said though. I believe most intructors get bored when they teach one course over and over again.
You need to find the "right instructor" just like I have done.
I am currently taking a course as well and my instructor never misses a class. She would gladly tutor you privately everyday for free so long as you show up.

What you learning??

Network administration.