In some subjects I find that getting through the whole book straight, and then doing that again four times helps to gain understanding more that doing lots of review on one single chapter. Ii think I see this effect in some subjects like Shas, or mathematics. In other subjects like Rav Shach' Avi Ezri or Reb Chaim of Brisk's Chidushei haRambam, i find staying on one chapter  with lots of review is more beneficial. 

And i might mention that this learning is of benefit to all Israel, as you can see in the Nefeh Hachaim of Reb Chaim of Voloshin the disciple of the Gra.