1. Xiaomi: Xiaomi Watch provides many functions, such as health monitoring, intelligent reminder and motion tracking. Cost-effective, suitable for students with limited budget.

2. Huami: Huami is a Xiaomi eco-chain enterprise, which has produced smart watches of Amazfit brand. These watches have many health functions, such as heart rate monitoring and sleep analysis, and the price is relatively low.

3. Huawei: Honor brand smart watches launched by Huawei are also very popular among students. These watches have a variety of sports modes, heart rate monitoring and GPS tracking functions.

4. Watch: Watch is a brand specializing in the production of low-priced electronic watches, which are cheap but fully functional. They provide basic health monitoring, notification and reminder, pedometer and other functions.

5.Amazfit: This is a brand launched by Huami, a China company, which provides all kinds of cheap smart watches, such as Amazfit Bip and Amazfit GTS. They have long battery life, multiple exercise modes and health monitoring functions.

Please note that the above suggestions are for reference only, and the specific choice should be decided according to personal preference and budget. Before buying, I suggest you read the comments, compare the functions and prices of different brands and models, so as to choose the watch that suits you best.