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it depends on what specific subject of bio you are going to study.
@choi this time i am studying
Cell Structure and Function
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for photosynthesis, it's better for you to understand the big idea first. I'd start by drawing a simple diagram of the big picture of the process of photosynthesis. then i'd go studying the specific steps of light reaction and calvin cycle.
for cell structure and function, it's also helpful to understand the functions of each of them. when I studied for the functions, I started by memorizing the steps of how the proteins were produced. First you have memorized the steps, it kind of makes sense how each organelles would work: i still remember the steps: nucleus-ribosome-er-golgi-lysosomes-outside the cell.
I agree with @Choi about diagrams. When I was studying cellular respiration for an exam last semester, I drew the various cycles on paper, using different coloured pens to highlight e.g. what enzymes are involved. I found it really helped, and I'll probably do the same this semester for photosynthesis.
Ultimately, though, you need to find out what works for you. I think drawing diagrams is a useful strategy for most learners, so I'd recommend at least trying it, but you might also want to e.g. watch videos on the topic. There are plenty on Youtube: some very basic, others university-level or higher.
Another strategy that I use is simply to head to the library with a pile of textbooks and spend several hours writing out, in point form, everything that I've been taught in the course. It takes ages, it isn't much fun, but it works. I need the textbooks because when I'm studying this way, I inevitably discover that there's something in my notes that I don't understand, so I have to look it up. Making the effort to look things up also helps me remember them.