Well I also opted i law but the same thing happened to me....this subject failed to develop my interest thats why i switched to criminology but keep it in mind i did not cover even a single topic of i law. So if you have covered more than 20-25% syllabus and you think that you can do its remaining syllabus easily then go for i law otherwise just change your subject. If i talk about myself i cannot stick to a subject that is unable to occupy me. Just analyze yourself and take your decision.