American Accent Training: Grammar by Ann Cook has a good section on the word get. I see you're from Australia, so might be put off by American accent in the title, but note the word grammar in the title also. Lots of good information on general grammar and usage in this book. It's written as a self-learning guide, so should be easy to adapt to your needs. Not much in there on take. I can see that a doctor would want especially a good understanding of the usage of take.

English Teacher