Any short test is not capable of providing high accuracy often cuz it might be too limited in asking questions, that doing result more inaccurate Generally, you can try surf the Net for a shortened version of the CEFR or IELTS. However, I've no idea how you will pass the speaking part online in a brief format We are looking forward to an "English proficiency test" full% speed run! ;D
Yeah, Im familiar with the cambridge and ielts format.