I am looking to resit my ccn1, I am time served and passed the test in 2011 but had a carear change and went to work offshore for the last 9 years, looking to get back to gas side of things, just wanting to know has alot changed in the test, What is the best resource for studying/revising. I have the old corgi books us their anything worth looking at or new things i should look into, any help appreciated thanks