I am not very sure about classes at kolkata. There is a faculty called Harshad Jaju. His trial classes on CARO, 2015, Cost Audit Rules and Company Audit 1 are available on youtube. Check it out. One of the best faculties I have come across. Give it a try. The complete classes are available in the Form of Pen Drives (Cost: Rs. 6,000/- a bit higher I feel). If you can afford, definitely the best.
Reference: www.swapnilpatni.com
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