Hello Aspirant,
It I s difficult to compare arts, science and engineering streams with each other. If you are truly confused between the three use any of the below given methods choose your Bachelors degree course.
Since you are waiting for your 12th board examination marks and even though you don't have a precise marksheet in front of you, you might have an idea as to which subjects you did better at. So if it is physics, chemistry and mathematics you can choose engineering streams or science base streams (ie, BSc or Btech /BE). If you are interested in say languages or you like history, geography, Economics and such subjects take an arts based course.
Make sure to keep your probable score in mind the cutoff marks will eliminate candidates at due times so apply based on your scores(estimated).
You can also go by your interest levels. You can either download syllabus for various courses you find interesting or watch YouTube videos on different courses.
If placement opportunities are what you are looking for then go for Btech /BE. Since they are professional degrees which boost chance at getting placed compared to arts degrees.
Hope this helps and Good luck
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