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Car cover works good, if you don't want to get the Lexus one $$$ costco sells one for $40 generic but it will protect it from the sun and the worst thing, bird poop it will eat through your paint like nothing.
Your circumstance is confusing. Do you need to drive the car daily and park it in a parking lot in the sun? Or are you not driving the car while you are away at school? If you are not driving it, you would be wise to store it in a storage unit until your return. If you are parking in a parking lot daily and concerned about sun damage, the only sure protection is a cover. If you can't have a cover (as you said - because they need to see the sticker), then good tint and a sun shade for the front window are your only friends, and you'll just have to suffer the indignities of sun damage to the paint and exterior.