ДАЙТЕ ВІДПОВІДІ - English

This would give you an indication of the level of your grammar or vocabulary. It is not 100% ”accurate”. It shows recognition and not really production.


https://learnenglish.britishcouncil.org/english-levels/online-english-level-test

However, for production - speaking and writing - you would need to be actually assessed by someone testing these skills. This is what Cambridge certifications and IELTS do.