Any biology majors present?

I've always wanted to study biology, it's the only subject which I've been passionate about. I'm about to drop everything in order to study for the entry exams for Master's program.

Any book, study platform, YouTube-channel recommendations to help me study all things related to biology?

I've studied biology for some years and I know the basics of cell biology, genetics, ecosystems, anatomy etc. Though, I'm planning to start from the scratch to make sure that I nail the entry exam.

Pic semi-related, there's a human female and some hay.