Yeah, don't worry ra123, as Csanás says they should be already verified or will double check it.
In any case also in the FAQ http://imaginecup.com/support/faq.aspx#Question2.2, states the following:
If a student does not attend a four-year university, can she/he participate in the Competition?
Absolutely, any student attending an accredited high school or college either full or part-time can participate.
Can I compete in the Imagine Cup if I recently graduated from school or am working as a graduate student?
Yes, you are eligible to compete if you meet the applicable age requirements, and you enrolled as a student at any time between January 1, 2008, and May 31, 2009. Additionally, the school at which you are enrolled must be an accredited educational institution that grants high-school or college/university (or equivalent) degrees. Graduate and PhD students are also able to compete, however they may not use unpublished research.