Hello, rinriera!
Thanks for sharing your recording about your favorite subject! It sounds like you really are into (really like) science!
First, you are quite fluent. Your speaking speed is good, and your pronunciation is good, overall. I would encourage you to work on linking your words together more and on saying the /th/ sound correctly. Right now, your /th/ sounds sound like /d/. Here is a link to help with linking sounds and words together:
http://pronuncian.com/Linking/
You directly answered all of the questions and provided good details in your answer. Your speech was coherent and organized. I would encourage you to add some transitional words and phrases like “additionally” or “first” to help your ideas connect more clearly.
You have a good command of vocabulary, as you demonstrated when you said “applicable.” Keep working on building your vocabulary.
Grammar could use a bit of work. You regularly made subject / verb agreement mistakes. Here are some grammar notes:
The teachers explains clearly - EXPLAIN
Classmates is also good –Classmates ARE
All of them is actually quite fun – All of them ARE
Most of my majors I’m interested in is science - ARE
You can know the reasons about it - you can learn the reasons for it
Best wishes as you continue to practice!