Ok, here is how I did it:
Identify the level of the topic:
- ecosystems
- individuals
- cells
- molecules

Each level has its own tricks and important things to remember. But the most important thing is "everything is connected". So it doesn't matter if you forget a detail, it will come up while you study something else.

Second, and in the same spirit of "everything is connected": draw networks of concepts, objects and subjects. Connect them all by processes.
The more drawings you've got (by yourself) the better you will understand things.

Understanding is key. Do not ask why things happen but how they happen.
How would it be if you removed an element from the network. How would you prove the element is actually there?

These questions work for every level.

Those names and your memory.
Even though some names sound strange (and often too long), they are helpful. Find the root and origin of the names and it will immediately tell you about its characteristics. This is the case for enzymes, most of them are named because of their primary activity.

And last but not least: think 3D! It is very important to see the world in all its dimensions. The cell is not a fried egg (not a water balloon either).
Once you are comfortable with this, think 4D. Things change over time and processes occur in parallel.

So if you find it challenging, don't be affraid and accept the challenge. You are in for quite a ride.

I hope it helps.
Source(s):
Personal experience. I've got a PhD in Biology. It wasn't easy but an amazing adventure.

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