Judicial examination is an art of giving up, and most details account for low marks. Two volumes and three volumes are mostly "constant weight". If you review carefully, the level is almost the same, mainly when you grasp civil punishment. Don't forget to look at the small law in 1 volume and the four cases in order to govern the country according to law. Some people say that 1 Volume 4 is the last surprise, but the characteristic of judicial examination is that the less you review, the less you may want to take it in the end. In this case, you have to carry a lot of things, and most people are here.
The above is just my personal suggestion, for reference only. Of course, you know your own situation best. Finally, I wish you good luck in the exam this year.