Hello Hitesh,
Well in today's world learning these particular skills has become quite neccessary. Surely you can do a advance excel course, which inturn can help you in your coming life. Except these, other courses are also available through which you can gain some new skills which will also help you in your career. Since you want to persue finance after 12th, so its a good option to learn advance excel.
Good Luck !!!!
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