1. New Oriental Education: As one of the largest education and training institutions in China, New Oriental provides comprehensive postgraduate training courses, including tutoring and mock exams in English, mathematics, politics and other subjects.

2. Learning and thinking education: Learning and thinking is a training institution that focuses on primary and secondary education and also provides postgraduate training courses. Their team of teachers is experienced and pays attention to cultivating students' learning methods and thinking ability.

3. Chinese public education: Chinese public education is a leading examination and training institution for civil servants and institutions in China, and also provides postgraduate training courses. Their teacher team consists of experienced graduate tutors, focusing on cultivating students' comprehensive quality and ability to take exams.

4. Tuhua education: Tuhua education is an institution that focuses on civil service examinations and postgraduate training, and also provides postgraduate training courses. Their teacher team consists of first-line graduate tutors and proposition experts, focusing on cultivating students' problem-solving skills and test-taking ability.

5. One-on-one counseling institutions: In addition to large-scale training institutions, there are also some one-on-one counseling institutions that provide personalized postgraduate counseling services. These institutions can tailor their study plans and counseling contents according to students' needs and levels to help students improve their grades.

No matter which training institution you choose, you should pay attention to the following points: first, choose an institution with good reputation and credibility; Secondly, it is necessary to understand the faculty and teaching quality of the institution; Finally, we should consider our own learning needs and economic ability, and choose the training methods and courses that suit us.