THE Clue

Really sorry about the delay! I totally forgot about the deadline that I had set. Haha. Here's the clue to my riddle:

'A' Level Chemistry students have an advantage.

As compensation, I shall extend this deadline to Sunday 25 May 2008 instead. And, there is a final clue I will disclose then, if no one has yet to solve this riddle ;)

The prizes are now:

First Prize: A drink from The Coffee Bean
Second Prize: A scone from The Coffee Bean
Third Prize: One packet of M & Ms, flavour of your own choice

(doesn't the third prize sound familiar? =P)

Jiayou to whoever is trying :)