Looking on the internet deeply has found these results:

high english proficiency is the most popular phrase on the web.

advanced english proficiency 12,320 results on the web	high english proficiency 156,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Because for an Advanced English teacher you seem awfully naive to me. I've passed the English Proficiency Test level 2. My last class of the day is advanced English, English proficiency is required.	I taught junior high English before everything went to hell. English proficiency is required. I've passed the English Proficiency Test level 2.

advanced english proficiency

12,320 results on the web

high english proficiency

156,000 results on the web

More popular!