Go back and take a good look at those two choices, see what's different about them and why did you fall for the trap for the wrong one. If you stop yourself from making the same mistakes, you'll run out of mistakes to make before you know it, =)
Hmm.. try going back to OG 11. It has very clear explanations of why each "bad choice" is doomed and what's great about the correct one. That should clarify some of the ambiguities for you.
Maybe the end is just around the corner but you've still got to keep marching to get there and not wonder off track. 加油努力!