Hola Maria, 

I used to do whatever I could to avoid doing homework, so I have wonderful memories of watching cartoons, and horrible memories of rushing to do my homework just before the class started.

Multitasking

in At school I loved at the same time to do my homework and watch cartoons at the same time, but then I noticed that all of my work was in vain because then I found there were a lot of mistakes.

multitasking

in school I loved  to do homework and watch cartoons at the same time.But then I noticed that all my work was in vain because  I found there were a lot of mistakes.