Waitlist Process??? Help!!!! SOS

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<p>Currently i got waitlisted at CAL POLY SLO</p>

<p>Ive read some threads and ppl were talking about sending letters by the 15th or something</p>

<p>i didnt know what to do? is it okay to send the letter late? can someone explain what the process of waitlist is?</p>

<p>i heard that if u write that SLO is ur #1 school u move up on the list? is this true?
thank you</p>