Dear you might study basics of geology which seems to you very easy but i will not recomend you to opt it because geology is very vast field and you may face many problems during your study and i my self did geological engineer but still many things remaing in my course because of lack of notes , students of geology.I will recomend you to opt geography instead of geology because it scoring and interesting too and islamic history is not my subject but you should opt European History or british history the reason is that many of our students opt islamic or hindu pak history and the checker gives those good marks who is best among them so the competation is very tough in these subjecti.e islamic and hindu pak history so you shoul opt unique subjects for getting high marks and history subjects are easy to understand and you need no teacher for it.