According to your needs, you can see that the main purpose of cycling is commuting to school. According to what you said, we can know that there is a slope on your way to school, and you are very tired by riding a flying bike. Although you can solve this problem by shaking your bicycle, it will take a lot of energy and be dangerous if you don't lock the pedal properly, so I still recommend a variable-speed bicycle. Then, the mountain bike itself is not designed for commuting, and thicker tires are more laborious, so I recommend variable-speed folding bicycles, such as folding bicycles with large lines. There is a 6-speed folding bicycle 1000 or kaa06 1, or ask for some money from home, about 2300, and many people ride it.

At this point, I hope to get your adoption.