It depends upon how the adoption is facilitated. If the arrangements are made by a licensed adoption agency, the answer is no: once a relinquishment is signed, it cannot be reversed. However, if a lawyer or facilitator arranges the adoption, the paper signed by the birth mother or birth parents is not a relinquishment--it's a different document, usually called a consent, that does include a timeframe for changing her mind. A few years ago it was 180 days--I THINK I heard that it had been shortened to 90 days.
In an undergraduate school, or in law school? In law school, Real Estate and Contracts are two different courses, and there are no easy courses in law school. But I understand undergraduate schools now have abbreviated versions of some law courses, and they may not be too bad. The general principles are not that hard to understand. Law school needs to go beyond the general principles to the working out of all the details and exceptions in case law. Memorizing those case names and major facts came so hard to me that it was a relief when the financial aid was pulled out from under me and I had to quit.