I attempted the paper in Urdu & suffered a lot due to the same reason: lack of practice writing in Urdu. I haven't decided yet whether to attempt in English or Urdu this time but one thing is for sure; I won't be attempting in Urdu if I don't get the time to practice. Moreover, the sort of paper we had this year, didn't require Quranic verses to be quoted as such. So it was a blunder on my part to attempt in Urdu. I think you should stick to English if you don't get to practice in Urdu.

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...and I am the dark of this our new day