Is nicmar certificate useful?

If you are talking about job opportunities, then yes, a NICMAR certificate will be helpful. Although the NICMAR certificate will help you get a job, your salary and job profile will depend entirely on your skills. Further, as you grow in your career, your certificate will not matter much. 

NICMAR doesn’t have the brand value effect it used to have in core industries due to its increased student intake. So, a NICMAR certificate can be helpful to get peripheral jobs but it will not help you get into the core sector.