Hello Savita,
To become a data analyst you can enroll in diplomas or certificate courses on the subject. However you will be more employable if you possess a masters degree. You can opt for any of MCA/MSc/MBA/PGDM or even M.Tech. You can choose any of these subjects.
Computer science
Information management
Finance
Economics
Mathematics
Statistics
To answer your next question Statistician is a well sought after position especially in the government sector. Check for different state psc, upsc as well as ssc notifications for the same
Hope this helps and Good luck
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