You can check the guide to CEFR levels and you can do a level test.  I recommend Dialang (funded and maintained by Lancaster University) an online diagnostic system to assess language proficiency in listening, reading, writing, grammar or vocabulary.

Don’t worry if you are not sure…  Before you begin your coaching sessions with me, you will complete a short level placement test and you will engage in an informal conversation to assess your speaking skills in the free introductory session.