HELP NEEDED IN BIOLOGY

I'm high school senior and biology is one of the hardest in our curriculum.

Our biology syllabus is basically 85% memorization.

I always make sure that I understand everything but the problem comes when I try to memorize.

I memorize better when I'm walking but I lose focus FAST.

Not like I start scrolling and lose the track of time, I literally stare in wall thinking of smth not important and I realize only few minutes later, and it's really hindering me cuz sometimes I need double (even triple) the time to memorize one paragraph.

I tried pomodoro also and it didn't work.

I don't have problems in subjects that require more understanding tha memorization (math & physics). In those I can lock in for longer sessions.

I appreciate any advice.

Thank you in advance, and sorry for any grammar/vocabulary mistakes.