Błędnie: Before you are admitted to the course at that very level, your teacher in spe must check whether you have got some elementally knowledge of French. Poprawnie: Before you are admitted to the course at that very level, your teacher in spe must check whether you have got some elementary knowledge of French.
"Elementally" to przysłówek oznaczający 'żywiołowo'. "Elementary" to przymiotnik o znaczeniu 'podstawowy', 'początkowy', 'elementarny'.