Sources of islamic law is the most important topic. Throughout previous papers a question has been asked regarding a source, either be it quran, sunnah, ijma, qiyas or ijtehad.
Next comes family law, it is also significant as mlfo ordinance and some other recent laws are related to it. Go through essentials. Dont confuse yourself with fiqhs.
Understand the topic more, as analytical questions are being asked as you could see in 2016 paper.
Hope this helps. Best of luck.