This is actually quite simple. First of all, you should analyze your weaknesses according to your actual situation. For example, if your English is not good, you can make a reasonable plan to improve your English. For example, you stipulate that you should read English for one hour every day, do a set of questions, and then stipulate how many days to complete a set of questions. In this way, you will make great progress as long as you strictly follow your own plans and requirements during the winter vacation. You won't feel that this winter vacation is deserted and you have done nothing. No matter what you want to improve yourself, the most important thing is to make a practical plan for yourself first.