You should be in the same class, and there is no English placement test. You don't have to worry too much about your study. There are not so many exams. You should live with plant protectors. Don't worry too much. All seniors will help you. If you are from the south, you should pay more attention to your health and diet. You can buy bedding without it. Bring a mosquito net. Mosquitoes are still very poisonous in September. Don't forget to protect yourself from the sun during military training. I don't know the food in the canteen and it's not to your taste. Try to adapt! Winter in Shenyang is still very cold, don't freeze!
When you are in college, you don't just want to study. In a school like Agricultural University, exams are just so much. You can't completely test a person's true strength. You don't understand this now, but you will understand it later. There are too many Internet cafes in Agricultural University. Just don't fall. Do something meaningful that you want to do. I hope you have a good college time!
Ps: CET-4 and CET-6 are not allowed to take the exam first, that is, it can only be taken in sophomore year at the earliest, so freshman year is easier. Do what you want! Have fun!