It doesn't matter whether you wear a school uniform or not (our school tells us that we should wear a school uniform to take the exam, which helps the class teacher to find students. Several schools took the exam together that day, and I saw that some students were not wearing school uniforms. So it depends on your own requirements)
There is no hard and fast requirement, as long as you wear something suitable for exercise (don't wear jeans or tights, keep cool)
In this year's exam, I wore a long-sleeved T-shirt and a pair of pants below (I was surprised that I took off my school uniform coat and sweater to reduce the burden during the long-distance running, and my score was 9 seconds faster than the perfect score).
Good luck next year! ! ! (In other words, many people in our class got a perfect score of 15 outside the school this year, but unfortunately they were in it. )