help??

[SamHolloway96]

My s3 has just gone weird it's saying android Os is omega hundred percent usage of the battery and in gsam it's saying android system is using 35 percent of battery and sd card 10 percent I don't even an sd card!! Its really frustrating me also for a few days the ram is always really high and when I clear it, it only goes down to 450 and not 340 and now the battery life is shocking. Any ideas? Should I reset? I'm just on the official jellybean update btw