Here at EnglishGrammar.Pro, we are always looking for new resources that position language features on the CEFR scale. Note that, unlike Cambridge which uses what students can produce, Oxford uses the receptive knowledge of students to allocate the levels. One great resource is their phrase list.
The Oxford Phrase List is a list of 750 common phrases from A1 to C1 level. It includes idioms, phrasal
verbs, compounds, collocations, prepositional phrases and other common fixed phrases.
Click here to access the full phrase list.
The last phrase on the list at their ‘highest’ level of C1 is ‘with the exception of‘. This sense is found at B2 in the English Vocabulary Profile and in Pearson’s ‘Toolkit’. For example:
About three weeks later, the entire camp, with the exception of a couple hundred of us, were sent to the gas chambers.
Another resource that they offer is a ‘text checker’. See the snapshot of it below with a sentence that we entered.
Unfortunately, as seen above, their checker does not work at the grammar or phrase level. Compare that with the English Grammar Profiler at EnglishGrammar.Pro:
The most remarkable feature of this is the ‘activities’ tab which might be useful for teachers to create quick gap-fill exercises.
There are also vocabulary lists such as the 3000 words you should learn first: oxfordlearnersdictionaries.com