Robert Louis Stevenson has been one of my favourite authors since I was a kid. Unfortunately, there aren �t a lot of relevant worksheets beyond the usual readers or related �film � stuff. But there �s nothing wrong with doing a wee bit of research yourself and making up a worksheet.
Depending on the age and relative maturity of your student, you could look at the book on several levels. The book is essentially about split personalities: on the basic level, a rattling good horror story. But Stevenson - a Scot - also had a lot to say about the dualistic dilemma of Scottish society at the time (James Hogg, of The Private Memoirs and Confessions of a Justified Sinner fame, was one of his favourite writers; and he was also fascinated by the story of Edinburgh �s Deacon Brodie).
The Scottish poet Hugh MacDiarmid referred to this sort of dilemma as the �Caledonian Antisyzygy �: an attempt to describe, but not necessarily reconcile, apparent moral contradictions in the Scottish character. He implied that this is something which applies to many small nations with larger, culturally imperialistic/colonialist neighbours (check out Michael Hechter or Tom Nairn for further study).
I hope there �s something here which you can use, one way or the other.
Regards,
Alex