wow you reply fast too.

Normally, mid career people take up masters for several reasons:
1) change of industry
2) promotion requires masters
3) improve professional proficiency

However, if you take masters right after your Bach in hope of landing a higher paying job then you are going to have a bad time. Masters without exp will deem you overqualified for most jobs.

You stated that you have 1 year of exp, which is in the form of an internship.
Question is, is that counted as 1 year of exp in the public service?

Annual increment in the public service varies from agency to agency.
A rough guide from the civil service is:
200-300 per year for relevant exp.
halve of that for non-relevant exp.