In reply to bigbadsquare:
Well, for a start 6 weeks is a very short period when it comes to moving up grades and twice a week not that intense. So don't be disheartened.
Watch other boulderers, especially the good ones when they are warming up on the easier problems.
What's your body build? I see a lot of people with upper body strength ignoring their foot placement, simply trying to haul themselves up a problem with legs kicking about until they land somewhere. Think about where your feet will go as well as your hands.
Repeat those routes at the edge of your ability and try to vary the types of holds you use (even the slopers which few peopel like). If there are routes you find easish, again repeat to build up stamina. Maybe try skipping some of the holds to vary the difficulty?