How to get weed out of your system in 24 hours?

Im 17 and I applied to work at this restaurant and i got a call from the boss today and she wants me to go into meet her tomorrow at noon. My friend works there too and she said that they drug test you before they hire you. I hadn't smoked weed in about a week and a half and then on sunday night i smoked alittle and then last night i also smoked. Im not completely sure if they'll drug test me tomorrow but im nervous and i have been drinking alot of cranberry juice and water. my friend said that she went into meet the boss and then they scheduled for a different day for her to come in and take the drug test. Is there anything i can do? i really need this job. How can i get weed out of my system QUICKLY?