Should of got that signal book within the 1st few days after orientation. But start with the rule book and induction Manuel. Signal exam is going to be easier than you think. The multiple choices are no brainers. Get one wrong and you're out. No excuse for that. The write ins afford you a little more room for error. But like someone said, don't over write. You can't take stuff out if it's wrong, BUT if you "forget" to put something in, you may get a chance to explain yourself. With that said... They want the type of signal, (fixed, low home, standard home, approach, automatic, grade time, etc) and what to expect when you encounter it.
Example
Green over yellow
Fixed interlocking standard home signal
Proceed at allowable speed expecting the following signal to be clear,
Continue on diverging route.
That's what they're looking for.