Hi achintya trivedi

If you are looking for Mba in marketing it is pretty booming feild first tel me how good your in marketing based on interest have u applied for any college? 

Sales 

Sales Management mainly deals with managing a company’s sales operations. Sales management is mainly responsible for meeting the sales targets, hiring sales staff, training sales staff, preparing sales reports, order collections, stock checking, managing retailers and whole sellers, etc

Marketing mangement

 Marketing management mainly focuses on the practical application of marketing techniques and the management of a firm's marketing resources and activities. Marketing management is responsible for influencing the level, timing, and composition of customer demand.

Marketing communication (MarCom) is a fundamental and complex part of a company’s marketing efforts. Loosely defined, MarCom can be described as all the messages and media you deploy to communicate with the market.

Marketing communication includes advertising, direct marketing, branding, packaging, your online presence, printed materials, PR activities, sales presentations, sponsorships, trade show appearances and more.

Good luck 

Its better not to focus on specific fields right now. All B schools follow similar curriculum pattern where in the first year they reach courses from finance, marketing, strategy, operations, sales, etc. When you move to the second year, you can choose electives from any of the above mentioned streams.
Now to give you a brief idea about the terms that you've mentioned:
Sales management deals with meeting a company's sales targets, preparing reports, checking stocks and working with network of wholesalers and retailers.
Marketing management focuses on application of marketing concept and deals with the positioning of the product and targeting of the right segment.
Hope that helps.