How similiar is the LNAT to the LSAT?
The following information appears on the official site about LNAT preparation:
“If you want to do more practice beyond our practice tests, you could consider trying some similar practice questions from other sources. Many are freely available. For example, the LSAT (Law Schools Admissions Test) used by law schools in the United States contains similar multiple choice items. The LSAT passages are typically shorter and the calibration of the questions may not be the same (law is a graduate-entry programme in the US) but the skills involved are identical. Visit the LSAT website for their practice test 
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LNAT Preparation and Tutoring - Toronto, Canada 