"Out of your mistakes, something good comes from it"

But what good does a mistake bring you other than the lesson from it?
I ponder on the quote...
"something good comes from it....something good out of it...but what??"
"Of course!!"
Something clicked on my mind.
"Maybe there was good out of my mistakes...."
Last year I transferred to UC but I stopped my studies for petty reasons. I decided to apply for a job. In one of my applications, an agency was looking for qualified applicants to attend a free call center training at Informatics and endorse them to call centers after the 40-hour training.
I was one of them.

Several days later, I was in one of the classrooms in Informatics with other skeptic applicants.
This isn’t the right choice but….I want to be here and hope to get a bigger chance in passing call center tests.