Dear Sna,
As i said earlier! paper of islamiat, these years, is current affairs based; for which regular newspaper reading is fruitful;
For basic concepts clearity like "Aqaid aur Ibadat" 'Islami nazaria i hayat' by prof.khurshied ahmed,is good.
Attempting paper in urdu or english does not matter a lot; what matters is, which medium one feels ease at.
Just try to attempt probable/expected questions in the medium of your choice,for few times, before the actual exam.
Stay blessed and regards!