If you are just starting to study then do this:
One day do Physics half the time (about 4 hours) and then chemistry the other half time (about 4 hours)
Next day do the same thing with Biology and Organic Chemistry.
Then the third day do Physics and biology again.
This way you keep switching around the subject then you have time to think about what you read the previous day. If you keep doing one subject in one day then it would not be that efffective (my personal experience)
.. And when you are done with the content review then do the same thing for the passages
And the MOST IMPORTANT THING that i think people on SDN are telling other is that YOU HAVE TO KEEP REVIEWING EVERY SINGLE DAY BECAUSE ONLY DOING PASSAGES WOULD NOT HELP YOU...
You have to spend at least 2 hours every night review 2 subjects. (one night review 1 hour physics and second hour chemistry)... i know its confusing.. but do you get it?