i hav clear nw b.com nw want to do mba so what i hav to do for that

appear MAT/CAT Exam apart of that appear different institutes entrance exam for get admission

You can give national or states exams like CAT/MAT/XAT/GMAT etc. You can take coaching for the preparation or every university conducts its own entrance exam , you can give you can just give there entrance, if you are specific about what institute or university you want. Batches of many universities

To do MAB u have to take up entrance exam like MAT,CAT,XAT,SNAP, etc. The main question is that where u want to do MBA? B-schools or IIM or some coll?