LSAT stands for "Law School Admissions Test" and is designed to assess reading comprehension and logical reasoning skills of prospective law school candidates.
Kaplan has many resources for LSAT prep though not all are free. The daily practice question they share is an easy exercise of your ability to assess & answer LSAT questions.
Free and recently updated LSAT practice tests and some other prep materials. Some things available online have to be purchased, so be aware of where you're looking.