The MCAT Hat Trick is an advanced study method included in the popular study schedule by the SDN user SN2ed. Quoting from the original post:
"Get a hat and write every single MCAT PS and BS topic onto a piece of paper.
Then, when you're ready to practice PS, put all the PS topics into the hat. Draw two
or three pieces of paper and connect the topics together. In addition to connecting them,
come up with what a passage might look like and what kind of questions you might get.
If you can't do this, go back and review each of the three sections. Rinse and repeat.
The hat trick days are important because they aid you in synthesizing the various topics together. On the MCAT, you utilize this skill for every passage because MCAT passages combine topics. Furthermore, you may also discover content weaknesses that you will need to go over."