Are you missing the same type of questions, or is it a random assortment of questions? Also, are they all on the same passage, or are they throughout the section?
If it's a type, spend the next few days studying how to answer those questions. If you're scattered, try to relax. Calm down. Slow down. Focus. As far as type of passage, that's a focus issue. You could probably buy yourself some time on certain types (if you're weak on science, try to move a little faster on the other sections you're doing -0 on) and then spend another minute or two reading the passage types that throw you off.