Try to Google answers and you will get 100% score ,I used to do same for the quizzes .may I know which offerwalls are you trying on beersurveys website?.
I tried it, still it didn't go well.
For PTC, usually I use Peanut Labs and Theorem Reach offers. Sometimes AyetStudios, AdGate, OfferToro, and AdGem, but not for their survey offers. I took these offers on other PTC site that I joined before BeerSurveys, so there's no chance for me to take it again on BeerSurveys.