CN recruitment

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A bud of mine went to one of them and turns out there's a surprise test called "switch test"... He said there were at least 150 people on that session, many failed the test.
Do you know where can I find practice tests for that switch test?...
I keep looking all over the net, but nothing.
Closest are some "railroad shunning tests" but they're not the same as the written version CN uses... CN is more like simple diagrams. So simple that many people failed...
The switching test is something like......train cars = ABCXYZ, with fewest switchs as possible make it ABCZYX, something like that, it's just to prove you have common sense, I'm going to an interview with CP in Winnipeg on Thursday to work on the gangs in saskatchewan, the conductor recruitment session for CN is in Sudbury which is an 18 hour drive, so hopefully I can get on with the gangs and not have to drive so far is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to - An online railroad bookstore featuring a curated selection of new and used railroad books. Railroad pictorials, railroad history, steam locomotives, passenger trains, modern railroading. Hundreds of titles available, most at discount prices! We also have a video and children's book section. - An online model railroad bookstore featuring a curated selection of new and used books. Layout design, track plans, scenery and structure building, wiring, DCC, Tinplate, Toy Trains, Price Guides and more.