You can chek subject with syllabus on microsoft/learing website from following link
https://www.microsoft.com/learning/en-in/certification-overview.aspx[
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and you can decide in wich subject code you are comfortable
Microsoft categoriese this as following
Developer
Database
Applications
Desktop
Server
MTA is funcdamental knowlage of subjects
but if you go for MCSD then you will have expertise of subjects