From the pages of Paul Brians’ book Common Errors in English Usage (Sherwood, Oregon: William James 2013, to which he allows unfettered access at no charge at his Washington State University web page, here is a worksheet worksheet on the adverb nevertheless and the adverb and preposition notwithstanding. This document stresses that these word are always spelled as one, not, therefore, as never the less or not withstanding.
My own contribution to this material involves defining these words–which mean basically the same thing–and stressing their use as transition words in prose. This is an unstructured worksheet; in other words, there are no cloze exercises here. Students will write declarative sentences from subject to period using nevertheless and notwithstanding.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.