We're gonna need a little more specifics if your gonna get any good advice. Are you doing AG or Extract? What did your recipe look like? What's your process...i.e. mash temps, how your measuring temps, mash length, efficiency numbers, sparge temps, pre-boil volumes and gravity, post boil volume and gravity. There are a number of things that could lead to low efficiency hence low OG, but these are a few. Let us know and we can try and help.