Court sided with the school, and t. l.o. took her case to the new jersey supreme court, which later found that the search was unreasonable and the evidence could not be used. the state of new jersey appealed the decision to the united states supreme court.
what does this mean?

Hi, Rida!
The court joined with the school and T.L.O. decided to take her case to New Jersey Supreme Court, later the evidence found was unreasonable and the evidence could not be used. New Jersey appealed the choice to the United States Supreme Court. 
I hope this helps;)
If you have any questions please feel free to PM me!