The reason is simple, chemistry needs memorization most. Chemistry is much more rigid than mathematical physics, but the key to doing well in the exam is to be familiar with various reactions and skillfully use equations and material properties. Mathematics and physics need more understanding ability, which is a kind of ability and talent. So people who are good at math and physics are smart. As long as you are willing to spend time in chemistry, it is not a problem to memorize properties, families, equations and chemistry. And you are really good at science and have considerable talent.

In short, three words, back!

Don't worry.