You could be a James Bond fanatic and have seen every film, but it's likely many audiences will only be familiar with the most recent, Daniel Craig fronted films. Eon Productions did a lot of work in making sure that new audiences could get involved with the new films, making Casino Royale (2005) a reboot of sorts.
However, for the A2 Media exam, a broad contextual knowledge to back up your reading of Skyfall is needed, and even the new films make constant reference to more than 50 years worth of previous installments.
While we would strongly recommend watching as many Bond films as possible, the following video gives a fun rundown of 10 of the best and most iconic Bond scenes. It would be particularly useful in a question on genre, pointing out instances of "repetition and difference" (Neale, 1980), or a question on representation and how this changes over time.
Just remember, your focus text is Skyfall, so make sure this is the film you make sustained, explicit reference to!
Top 10 James Bond Moments
(Thanks to Charlotte for the link!)