No combination is bad if you can justify it with your score in written. Punjabi is a very high scoring subject but Indo-Pakistan History is massive and very low scoring. My brother scored 740+ twice years back but his score in Indo-Pak was less than 110 each time. If i were you, I'd choose US History for Indo-Pak and Botany for Environmental Sciences. IR is a better choice as compared to Political Science. I'd suggest you to choose optional subjects very wisely for qualifying written in flying colours is sine qua non to your allocation.

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“What we need in this country today is more courage and more belief in the things that we have.”- Thomas J. Watson