Xi, pronounced "ksee", is a tough one in both its forms. But try these tricks. The three lines can be thought of as "Three for ksee!". The lower case form looks something like a cursive "E" - think of "Kursive "E" for ksee!"
"Omicron" is literally "O Micron" - the "little" O as opposed to the big "O", "O Mega", that we'll encounter soon. In ancient times, they were pronounced differently, but now they're both just "o".
Go on to the next three letters of the Greek alphabet.
You can also practice on some real Greek roadsigns. Get some more practice on using the Greek alphabet in Greece - compare airfares to Greece here: Find Greek Airfares


