It depends. First of all, if you won a prize, the Fair Market Value (FMV) of the prize is income to you , not a deduction. Did you receive a 1099-MISC for these prizes? Is that what the $120/$105 amounts refer to, or is that the price of your auction tickets?
If you are trying to determine your charitable donation for the auction tickets, generally the cost of raffle tickets is not deductible.
I will say, though, that there doesn't seem to be much value in these prizes, because they are so specific to your school, and wouldn't be worth any significant amount to a non-related party. I can understand the argument that the cost of the tickets was a donation because the prize was of no measurable value, but the IRS may not agree.
See Charitable Contributions You Think You Can Claim but Can't
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