@Rabia Aslam,
Muslim Law and Jurisprudence is an easy subject and scoring as well. Don't afraid to go for it. It will also covers your basic concept of Islamic sources, state, system of justice etc (questions of these types usually come in islamyat and general knowledge papers). OR

Go for International Law. It is also scoring and a very easy subject though, a bit lengthy. OR

Regional languages, in your case it should be Punjabi, are considered scoring machines. Your start in these languages may be slow but after giving few consistent readings, you will be able to overcome the hesitation and suddenly feel your grip on the subject.

The last decision maker is, of course, you.

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"Man is never Prepared for examination".Put in your best and hope for the worst...