Cost ca final old course

Hello Friends, do have anybody ca final Costing video lecture? i need video lecture for may 2018 ca final old course exam..In Nov 17 in cost exam only 27 marks..so kindly help anybody have Dani ki costing video or any other professional sir who are better learning cost and improve in next exam..only my 2nd group pending..my 5th attempt in may 2018 ..so pls help me..in cost subject and review how to prepare Cost subject?