Which month is the easiest?

Sorry, no shortcuts here.

LSAC, the organization that administers the LSAT, tries very hard to make every test equally difficult. It's true that some tests are harder than others, but it's not because they were given in a certain month.

That said, over time the test has gotten harder. As more and more students turn to outside help to prepare for the LSAT, the test writers have had to respond by making it harder so that it continues to distinguish students. Much like an easy college exam, if everyone gets an "A," there's no way to tell who knows the material best.