Question about Sn2ed's 3 month schedule

[dtinker1]

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"Day 26: BR Physics Chapter #4 + 1/3"
What does the +1/3 refer to? I have the 2012 BR books and i see the practice problems at the end of each chapter. Do we do just 1/3 of the problems?
Probably a dumb question but I am really confused!