1. Teaching quality: This is the most important point. You can check the evaluation of students in this institution through the internet to see how their teaching quality is. You can also ask the opinions of people who have studied in this institution.

2. Teacher qualification: A good teacher can help you learn Japanese effectively. So you should check the qualifications of teachers to see if you have relevant teaching experience and qualification certification.

3. Course content: A good training institution should provide comprehensive course content, including grammar, vocabulary, listening, speaking and reading. At the same time, there should also be courses for students of different levels and needs.

4. Learning environment: A good learning environment can improve your learning efficiency. So you can visit the learning environment of training institutions on the spot to see if it suits you.

5. Price: Different training institutions may charge different fees. You need to choose a cost-effective training institution according to your economic situation.

6. Class time: If your time is flexible, you can choose a training institution that takes classes at night or on weekends, so that you can arrange your time better.

7. Audition course: If possible, you can listen to the course first to see if the teaching method is suitable for you.

Generally speaking, when choosing a Japanese training institution, you need to comprehensively consider multiple factors to find the one that suits you best.