No. Once you've received an offer you'll be given a deadline to accept and pay a deposit. You can withdraw that acceptance at any time and go to a different BC school, but that means forfeiting the deposit that you paid at the first school.
Take care of your mental health and overall health before attending law school. I learned this after law school working in one of the most depressing areas of law. Nonetheless, I found the practice more rewarding than law school.
Difficult work and stress are perpetual in this profession, but your health is worth more than any tuition or salary/bonus.