The Nav exam is markedly easier to do once you've started doing cross-countries and have experience of planning routes and completing plogs. Makes much more sense after you've done it in the real world.
If you're coming to it just off the books alone, you might find it a bit trickier to get your head around.
A be very careful with accuracy - thin lines on the chart, and work out your plog correctly, especially with the winds side of the whizz wheel.
Usually, once of the answers will be if you've calculated a reciprocal wrongly, added rather than subtracted magnetic variation etc, so be very careful - it's very easy for the wrong answer to appear to be the right one by virtue of it being one of the options.