1. Carelessness: In the process of solving problems, candidates are prone to make some low-level mistakes because of carelessness, such as missing the requirements of the questions and making calculation errors. In order to avoid such mistakes, candidates should carefully examine the questions to ensure that they understand the requirements of the questions and carefully check the results of each step in the calculation process.

2. Conceptual confusion: There are many concepts and theorems in mathematics. Candidates tend to confuse different concepts in the process of solving problems, which leads to wrong ideas in solving problems. In order to avoid this mistake, candidates should have a deep understanding of each concept and consolidate their memory through a lot of practice.

3. Did not master the basic methods: Problems in college entrance examination mathematics often need to use some basic problem-solving methods. If candidates don't master these methods, they can't solve problems correctly. In order to avoid this mistake, candidates should systematically learn the basic methods and skills of mathematics and master them skillfully through a lot of exercises.

4. Improper time management: the time of the college entrance examination for mathematics is relatively tight, and candidates need to complete all the questions in a limited time. If candidates arrange their time unreasonably, it will lead to some problems that can't be finished or finished, which will affect the quality of solving problems. In order to avoid this kind of mistake, candidates should cultivate good time management ability in their usual practice and learn to allocate time reasonably.

In a word, the common mistakes in college entrance examination mathematics mainly include carelessness, confusion of concepts, inadequate mastery of basic methods, improper time management and so on. In order to avoid these mistakes, candidates should improve their attention and carefulness, strengthen their understanding and mastery of mathematical concepts and basic methods, and cultivate good time management skills.