It is true. The State of Washington has similar agreements with British Columbia, Germany and Korea. 

As long as your BC license is valid, you can follow the procedures same to the people holding an out-of-state US license. See here. This is only for British Columbia licenses, other Canadian licenses holders should take the test.

Getting driver license in Washington state when moving from Canada (BC)
Some people say since "so" is a transitional word, it should have a comma after it like all the transitional words have. And some say if "so" is there for logical continuity, then no comma should be used.

The particular sentence I am writing is:


  Moreover, I have completed my senior secondary studies in English and won 1st place at the regional stage of English Olympiad. So, I am confident that I will be able to complete a degree in English.

