M.S

Hi, BE CSE 70% is excellent. Since you have 1 year of experience and have certificate courses, it surely adds to your skill sets and abilities. But indeed, if there is some gap after the 1 year of work experience or even if your work experience is most recent, in either case, I suggest you take another year's work experience. 2-3 years of hands-on work experience post the under graduation helps to make a smooth transition to Masters. Projects and live scenarios and internships too assist in gathering recommendations and references.
In the 1st year that you work, browse and explore what course in Masters you want to do, what is the duration you are looking at, what country, what University and why, what scholarships and prospects thereafter you have. In Masters too, choose the course very carefully and after much thought and communication and research.