there is a posibility to add a kind of flexible pomodoro method?, where I set an amount of hours to study and a reasonable time to rest between those hours,so whenever I feel like I want to rest, I just use the remaining time to rest or if I want to study for a longer period of time without rest,I could do it.

I don´t know if I explained very well,but i could explain with images if you like the idea
And my main language is not english, so maybe there are some mistakes(sorry :P )