Hi, the best way to improve your playing ability is simply to do a lot of tactics; however, as you seem to be in a hurry, there is not a real chance for great improvement out of training- the only chance you have is to learn about some nice traps and hope that he's stumbling into them!
The best traps are usually found in Gambits, and Gambits also have the advantage that a lot of them end in the middlegame and you don't even reach an endgame. Since your opponent answers with e5 to your e4 move, you have a variety of gambitlines to chose from.
You should look up the nordic Gambit and the fried liver attack, since you don't always get into lines that allow an Evans Gambit, and Kings Gambit needs a lot of learning and practice. Maybe you find something that suits you :)
If you could permit me to briefly summarise my situation, as it is relevant:
I started relearning chess about January/February [My father taught me how the pieces moved when I was a child, that was about as far as I progressed] and I'm looking for some openings to explore. I originally started learning chess again for a very specific reason. One day I noticed my friend playing someone at chess at school, as a joke I thought I would challenge him to a game. Now I obviously was prepared to lose I hadn't played since I was about 12 years old, but I wasn't prepared for this kid to be the most smug, conceited arsehole about it. I resolved that day to learn chess all over again and beat him before the end of the school year. Now as it happens I've discovered I actually love chess a huge amount which is wonderful, but the school year is nearly out and it is getting rather pressing.
He was white in our last game so I'll be white in our rematch so defenses aren't as important at this point. I also know a few things about his style of play that my friend, who is coaching me, has told me. I was wondering if it was possible to adapt myself to an opening that would exploit these.
He has a predilection for passed pawns, he also greatly favours material exchanges as his end game play is particularly strong. Are there openings in which an opportunity for a passed pawn is something that should be missed, and he might stumble into? How is it best to avoid his material exchanges, or know when they work best to my advantage? [I realise that last question isn't that relevant to openings]
I also know that given the chance he will almost certainly play the four knights game, does this help at all?
I realise this is quite a long post, it's really all a bit of fun and nothing you should all take seriously. Just wondering if anyone could help.