Read more educational and popular science literature. Moreover, you need not just read, but try to highlight the main idea, emphasize the main thing, make some notes, check with knowledgeable people / on the Internet what you did not understand.
You can watch some scientific films and videos. There are a lot of them on the Internet.
But if this subject is not interesting, then nothing will help. You need to love this object, then everything will work out. For example, I adore biology, so neither at school nor at the university there were any problems with understanding it.
Just and stupidly accept
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