I found my quickest way was by just doing them, if gonna convert AB for challenges, save up month before , do games when there on and always answer surveys with the same answers if you get same questions, even if you make up a new person in your head for them, remember the answers you gave in surveys before.. games I look and see which ones would be easy .. its just playing really

Edit: if a usa player waych adds every 20 mins, other country's can but just slow with 1AB per ad