Costing prepartion

First Complete the OR/QT part first, Sanjay Agrawal sirs teach the Standard Costing Part in a way that the formula gets easily remembered so after OR complete Standard Costing, Then finish the short Chapters like life cycle costing, service sector costing activity based costing budgetery control and go through Theory book of Sir This will cover approx 80 marks(Including Options) and then go for relevant costing and dont give much time to relevant costing as questions from relevant costing in exams are always lengthy and many times twisted and hence usually these are left by students either up front or in the midway