I don't know whether the answer is high school students or college students. For college students, you can buy an electric vacuum storage bag, which is tiring to handle manually, such as some thick down jackets.
Other small clothes are put in this storage box. Buying a large size can hold dozens of clothes, and the one with wheels at the bottom is more convenient and not very expensive, tens of dollars.
Then the small cupboard equipped by the school will put some daily things, such as underwear. If you have underwear, you can buy something with underwear in the carriage.
If possible, you can buy one similar to this one, put it in different categories and you can see it at a glance when you take it.
When we went to school, we only had one locker for each person, and then we bought a big suitcase, plus our own suitcase, and put it under the bed in the lower bunk. Basically, clothes can be put down.
Then there is the storage method. For example, this semester is the beginning of winter vacation, so you can take less thick clothes, down jackets and woolen coats, which can take up less space.
Clothes that can't be worn out of season can be taken home on holiday or sent home. If there is really no condition, use a vacuum storage bag. No matter how thick clothes are, you can shrink them into cookies, haha, and then put them in the most troublesome suitcase and take them out.
According to my many years of accommodation experience, it is also very important. If you don't want to wash the changed clothes, don't knead them into a ball and form the good habit of folding them casually, or you will get a mess of clothes.
What's more, some universities are not very strict in checking beds. The two clothes you usually wear can be hung on the bedside, which will not affect others and save some space.
The most important thing is to learn to break up! Ha, ha, ha. I used to love buy buy buy buy's new clothes. In the end, many of them don't have a bedside or only wear it once or twice. I don't like it after wearing it again, but it's a pity to throw it away.
In this case, you can consider selling or donating, or see if people around you like it.