If you’re taking exams, look for lists of questions. Solve them - do short answers to the questions - memorise them.
Don’t get hung up on textbooks 1-2 times, read it, understand the basic definitions and system of the branch of law - go on.
In jurisprudence we have a lot of theoretical enumerations that you may need to memorise 90-100% if you are a student and you are interested in surprising your teachers.
Read my old article: How to create 1000+ places to memorize any information in an hour or less?
a 300-page textbook on a branch of law I can read in a day. And another hour or so can be spent on a short, concise outline for memorisation.
It is worth to memorise in an orderly way the name of terms (you will process the definition yourself, without mnemonics, and compress the information into words), enumerations.
In practice, in law, you need to understand the basics, a number of terms and patterns. Then read legal acts and go into your specialisation. The institute does it inefficiently and stretches it out.
On your own + with a mnemonic it is done faster. For example, in August to memorise all 7-14 disciplines before the beginning of the academic year (in my case).
I am a former bachelor of civil law major. I managed to have fun with mnemonics for 2 semesters of my 3rd and 4th years. The lecturer was looking for a phone or earpiece, haha.