I think preparation to time that ratio should be resonable. The key point is catch your level to the materials. If you remember the word slowly or your time little, you may prepare less number words in total. The ratio of time to amount should be appropriate. So examine your method and schedule by yourself rather than what material you own. All my opinions stated above are similar to the topic of the poster, don't worry your materials insufficiency. Just do it, and check your result and catch the key point. Good luck to everyone.
