Many new test takers of the new restructured exam report high number of questions discussing drug ads and abstracts .. can anyone suggest materials to prepare for these questions ? Thank you

There 's new Kaplan lectures 2015 - 2016 for Step 3. They have quite few examples both of biostats, drug adds and quality improvement.
Also High Yield Biostat. Also Uworld have an excellent Biostat review - sold separately from the other packages. So these three and whatever you find...
http://www.amazon.com/Kaplan-USMLE-Lecture-Notes-Authentic/dp/1625232713/ref=sr_1_1?ie=UTF8&qid=1424628504&sr=8-1&keywords=Kaplan+2015+-+2016+lectures


http://www.amazon.com/High-Yield-Biostatistics-Epidemiology-Public-Health/dp/1451130171/ref=sr_1_1?ie=UTF8&qid=1424628475&sr=8-1&keywords=high+yield+biostatistics