Hai Sumit

H1 is the work permit if you have employer here saying that your going to work with him then very well u can go ahead and do all by urself otherwise you need to go to us for exam once go back clear all the paper work for H1 after that you can come into us as an employee but otherwise only go is to come here is visiting visa but tell why do u think you have to come to us for just an exam i heard that you can take up the exam in Guam close to india.
anyway if your coming to us in visiting visa its not tough to get but lots of money......... anyway all the best. need any other information i would be glad to help iam working on my H1 now.