i passed mine end of last year and i didn't really need to revise much, just ensure you have read the highway code. if you are prepared to do more practise then, go for it, it wont hurt to do as much as you can but i shouldn't worry if you have only done the DVD. it is mostly common sense. tip: dont click too many times for one hazard on the HP test, you lose points for rhythmical clicking. :-( have a look around online, do different practise tests etc... to get a feel for the possible questions you might be asked. you got 48/50 which is really good so i shouldn't think you will have any problems. good luck.