For Physics…17 chapters or sections per chapter?
Counting today, you have 41 days (1 month and 11 days, including weekends) till August 4.
Using the final week for review, you have 34 days, just barely over a month for two subjects. For both subjects, you have 17 days each to study. For Precalc, with a chapter a day, you should have about three days for practice, tests or whatever you need to do. For physics you will be cutting it close- a chapter per day.
My recommendation, if you choose to do this, is to start Precalc first- the trigonometry in it will be needed for Physics. Review Precalc every single day, especially since its so heavily integrated in Physics. You have a slight advantage, since most people take Precalc and physics concurrently.
For physics, you need to fully understand the concepts in such a short timeframe. If you don’t understand the concepts then it will be a real struggle to get the correct answers.
Working hard, you should finish a chapter in a few hours. Plan breaks throughout the day so that you don’t get burned out. Watch videos online for extra reenforcement of the material.
And most importantly…don’t slack!
Good luck!
Use http://www.timeanddate.com/date/duration.html if you need to adjust anything. 