There are words for this. At a school or university, you would take an "English placement exam"; it would determine what English courses you would be allowed to take. In a more informal setting, you might take an "English evaluation" or "English assessment (test)." I suppose "English level test" might be a common collocation in ESL, or online ESL in particular, but it just sounds bad to me.I named so a test consisting of some question. And according to your answers you will learn whether you are A1,A2,B1... level
Thanks for answers.