To "interpret" something means to make sense of something. We can use it in a situation where you try to analyse something you are reading or hearing in another language. When you hear that, and you are able to say it in your own language, maybe explain it to a friend, or somebody who doesn’t understand, you are interpreting what you hear. But it doesn’t have to be a foreign language, it can be you own language. Sometimes we use this word for something that’s difficult to understand such as a complicated contract, for example.
To "assume" something means to think about something without having all the facts. We often use "assume" when we have discovered that we are thinking the wrong thing or we have made a mistake about something. For example, you thought that a friend of yours would not come to a party you are throwing, but she did arrive. In this case you could say to your friend: “Hey, I assumed you weren’t coming to my party.”
To "perceive" something means to sense or to feel something. We often use it when the information we are taking in is not very clear. For example, a teacher may "perceive" that her students are tired or bored because she is probably taking the clues from their body language. Maybe the students are yawning or there may be an even clearer message that they are bored or tired.
When you "react," you act in response to, or under the influence, of a stimulus or prompting. When something occurs or you notice something, then that means that you are responding directly in a particular way to that thing. When somebody throws you a ball, you are not just going to let it hit you, you are going to "react" to it.
Check out: The IELTS Is Easy. You Just Have to Be Calm.
To "analyse" means to take in detailed information and try to make sense of it. In a science class you are very likely to be asked to "analyse" some sort of data such as test results. Or you may understand a movie much better after you "analyse" it in depth. To "analyse" something means examine something and draw conclusions.
Watch the video to hear the full descriptions of the verbs and good luck in your IELTS exam!