An unpardonable sin for an Indian adult (and I mention this as advice for younger ones who can still help it) is to not be able to casually speed-read at least two languages. Almost every Indian can fluently speak, minimum, two languages, anyway.

This might seem normal to us. It is considered an achievement in most parts of the world. My spoken Hindi, for instance, is as good as any heartland bloke's. Written Hindi though, having dropped the language from formal curriculum Std VIII onwards, is abysmally slow - to the point that the eyes travel word for word, rather than the brain seamlessly absorbing thoughts and long sentences.