Okay, so you know how you're learning how to read and write in school? And you're getting really good at it because you're practicing a lot? Well, when you get older and finish school, you might need to take a test to show that you're really good at reading and writing in English. This is called a secondary level English proficiency test.
The test will ask you questions about reading and writing in English, and you'll have to show that you're really good at it. The test might ask you to read a story or an article and answer questions about it, or to write a paragraph or an essay about something. It's kind of like a big quiz that tests how good you are at English.
If you do really well on the test, it can show other people that you're really good at reading and writing in English. This could be helpful if you want to go to college or get a job where you need to use English a lot. But don't worry too much about it, just keep practicing your English and you'll do great!