@ harsh*t... complete the study material thoroughly...becoz case law based questions are generally not repeated...scanner is enough for cost n accounts paper and somewhat for general commercial law...but for others u have to study hard .
Study material provided from CS institute and scanner is Enough for getting a good result. But yes for costing and direct tax portion of group one, other reference books surely helps you more and for group two your study material is absolutely perfect for getting better result.