People choose Law as an Optional subject in UPSC Civil Services examination because it is high scoring, however, those choosing IAS Law Optional should have its foundation of degree level.There is an over-emphasis on Constitutional & Administrative Law then the International Law in Paper 1. So you must prepare it well and you may get up to three questions on Constitutional & Administrative Law. Contemporary Legal Developments should be to follow the legal news. Read policy magazine. It will help in General Studies as well and have legally reasoned opinion on current affairs. It is recommended you that you must cover these three portions very well. Firstly, Law of Contracts and Mercantile Law. Second Law of Torts third Law of Crimes. For constitution focus on all the areas and also read the complete cases of certain recent judgments. However, don’t try to do selective, as there is only one optional paper (UPSC Law Optional) now. You must aim to cover almost everything mentioned in the syllabus.