Bloomberg Law includes short (2-3 page) tip sheets for law students. Some are written by legal educators from around the country.
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Westlaw's Law School Survival Guide has some good tips, on everything from study habits to getting enough sleep.
Many of these books cover a range of skills, from briefing cases to taking exams. Some cover the whole range of law school, from beginning to the bar exam; others focus on the first year.
See our separate guide: