Where are you taking it out of curiosity? I was going to make a post about the BS at Drivetest but I'll just add it here. Just to add, I've been riding dirtbikes since I was 12 and had my full M for about 10 years but when I moved downtown Toronto I was a fool and let my licence expire so had to redo it when I bought a bike again.
I did mine 2 weeks ago in Brampton and the tester was a complete arse. Made everyone nervous and of the 5 of us, only a guy on a ninja 250 could do the slalom without putting his foot down. I touched twice and he failed me. During the emergency braking, he said get it up to 25-30kms, I had it at about 35, and stopped 6 inches from the line. He shook his head and said stop right on the line. When he was explaining to me that I failed, he told me I should go borrow a smaller bike (I ride a GS500F). I lit into him saying that wasn't realistic as this is the bike I ride, so why would I try and get licenced on a different bike. How failing someone for stopping before a line isn't realistic as if I was emergency braking I would want to stop as soon as possible, and that the only thing a slalom tests proves is you can weave through traffic.
Then I redid it in Orangeville this passed Monday. All 11 of us passed. I don't know if I just wasn't nervous or if the cones were further apart but I got perfect on the entire test. Tester couldn't have been a nicer guy and made everyone feel comfortable.
As for tips, I would recommend doing some slalom practice, and just try not to be nervous...it's not the end of the world.
Oh, and the problem with the diagram above, in Brampton the cones are only 10 feet from a roped area so you couldn't do the wide archs.