Which exam board are you doing? I'm with WJEC, but we use a book called élan 1 (it's purple) - it's really intended for AQA, but it covers everything. I actually self-taught the AS with a little help from the college, and I didn't find it too difficult.
In terms of tenses, you'll need all the GCSE ones and others like the subjunctive (aaargh!). There's a great French site that has a character called Tex, but for some reason it's not in my Favourites.
I also registered at this one:
www.sharedtalk.comIt's kinda like MSN, but you can meet French speakers from all over the world. I'd recommend getting a free Hotmail account that you use just for SharedTalk though, as some are quite keen to get your email address!
I didn't watch French TV too much, but
www.france24.com is pretty good. You can watch a program in French or English - I tend to watch the French first, then the English to check I've understood.
For the oral exam, I'd recommend a book called Mot A Mot by Paul Humberstone - it has tons of vocabulary in it, and it's more useful than the word lists in the back of the textbook.
Above all, you just need to keep your ear "tuned into" French accents. If you're looking for an excuse to slack off, maybe try renting Les Choristes - the version I saw had English subtitles.
Hope this helps, bonne chance!