桃太郎 -- A few things...
First up, I would very strongly suggest moving the third Book of Moon you have in your side deck to the main deck.
Also, it says on your deck list that you're playing 3 Bottomless Trap Hole -- this may have just been a typo, but Bottomless is semi-limited to 2 copies, so you'll need to get rid of one of them if that wasn't a typo.
Finally, I'm not going to lie, your side deck is a hot mess. My guess is that you're going to see a pretty varied meta line-up when you go to locals tomorrow, and the whole point of a side deck is to have some extra cards to give you the leg-up against unfavorable matchups.
Having said that, you should be side decking cards to help you against Blackwings, X-Sabers, Debris-Plants and the mirror match. With that in mind, this is what I think your side deck should look like. I realize you probably don't have access to all of these cards, but it'll give you something to work towards:
2 Cyber Dragon -- This is a GREAT side card in general. It's a free special summon when you control no monsters, and it's 2100 attack will be hard for a lot of decks to get around. Side this in against Blackwings and any other deck that uses monsters with high attack.
2 D.D. Crow -- This is also a huge side card right now, used primarily against Debris-Plant decks. Discard it and remove from play one of their creatures when they attempt to use Pot of Avarice and the whole effect of Avarice fizzles. You can also chain it to the effect of Debris Dragon to remove from play their special summon target. Aside from Debris-Plants, it's good in a lot of other matches as well.
2 Thunder King Rai-Oh -- Another staple side card. Stops your opponent from adding cards from their deck to their hand, and since you aren't running GK Recruiters its effect will almost never hurt you. It also can be sent to the graveyard to negate an inherent Special Summon (Cyber Dragon, Dark Armed Dragon, Judgment Dragon, a synchro summon, things like that that aren't special summoned by another card's effect). It's great against X-Sabers and in the mirror match as well.
2 Nobleman of Crossout -- A lot of top tier decks rely on setting monsters right now, most of which just so happen to be Flip Effect monsters, primarily Ryko and Gravekeeper's Spy. If you hit one of these with a NoC, it will remove all copies left in your opponent's hand and deck from play. The only catch is that it also removes from play any copies you might be playing, so you'll have to be careful with it in the mirror match! It's also great to use NoC in the X-Saber match if you read a face down Darksoul or Emmersblade, as NoCing either of these will remove them from play and keep your opponent from getting a search off of them.
2 Starlight Road -- Blackwings are going to be somewhat of a difficult matchup for you, and this card is great when dealing with Blackwings' trump card -- Icarus Attack. It can also be sided in against Gladiator Beasts to help deal with GB Gyzarus and a few other rogue decks.
2 Trap Hole -- Invaluable right now. Not many people side this anymore, but I'm of the opinion that it belongs in every side deck. The only deck that doesn't frequently normal summon monsters with more 1000 attack is Debris-Plants. This card will help you against almost every other deck.
1 Royal Oppression -- Your deck doesn't revolve much around special summoning, and this card will help you lock your opponents out of making their biggest plays while you build up field presence, allowing you to more easily summon Ra.
1 Mind Crush -- Literally EVERY deck plays some sort of search card right now. Pot of Duality, Gravekeeper's Recruiter, Charge of the Light Brigade, the list goes on. The point is that Mind Crush is incredibly useful right now. Say your opponent Sangan searches for a card you really don't want them to play. You now know what it is that's in their hand, so simply activate Mind Crush and make them discard it. The rulings for this card also allow you to see your opponent's hand to verify whether or not they have the card you declare for its effect. That's really valuable information!
1 Giant Trunade -- This isn't normally a card I would recommend side decking, or for that matter main decking. But I think it could really help you out against back row heavy decks like Blackwings. Trunade away their backrows to turn off their Icarus Attack, then set a bunch of your own back rows and blow them away when they try to attack.
Hope this helps!