Geography can easily give you 120 marks and if you do a little bit more hard work and put the soul in the paper by drawing the diagrams and like things, you can even go beyond 150 and believe you me this is not a herculean task...all you need is coverage of full syllabus...one thing that i want to warn you of is that there is no such room for maneuverability as is available in social sciences, so you have to be precise in your answer and to the point otherwise it can backfire in case you put your own analysis...