Which course is best as I got 90% in commerce stream ?
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So, a lot of courses are available to you. The most straightforward ones for you would be B com (P) and B Com (H). With your score, you will be eligible for a lot of government colleges, most notably in Delhi University. So, do apply for that!
Do keep in mind that Economics and business don't necessarily come under 'Commerce', so I have omitted them.
In addition, there are a lot of side courses one can pursue which go on to become future careers. For example, Chartered Accountancy, Chartered Financial Analysts, Acturial Sciences etc. There are separate entrance exams for each.
So, yes, do explore your options, go through the curriculum of each course, and overall, do what you resonate with. Good luck.

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