1. Prepare the course selection plan in advance: plan the course you want to choose in advance, including the course number, name and time, before the course selection system starts the course selection. This will help you quickly locate and confirm the courses you need.
2. Familiarity with the course selection system: Familiarity with the interface and process of the course selection system on the mobile phone can help you to conduct the course selection operation quickly and accurately.
3. Use a fast network connection: Make sure that the mobile phone is connected to a stable and fast wireless network, and ensure that you can respond in time and submit the course selection operation.
4. Multi-device standby: If conditions permit, you can try to use multiple devices to choose courses at the same time, such as mobile phones, tablets or computers. On the one hand, this can improve the efficiency of course selection, on the other hand, it can also deal with problems such as network delay or failure.
5. Set reminder and countdown: Before choosing a course, set reminder or countdown function to remind yourself of the time of choosing a course. This can make preparations in advance and ensure that you can operate at the beginning of the course selection.
Please note that the above are some common skills of grabbing classes, and the actual operation may be different because of the different course selection systems. In addition, the skill of grabbing classes can't completely guarantee that you can successfully choose compulsory courses, because the fierce competition of the course selection system depends on the specific situation of each school.