Hi,
    See if you are in twelth then its not possible to change the stream but if you are in eleventh then it is possible to change the stream. But better would be if you ask your school authorities they would tell you in a better way.

Hello,

I don't think so that's possible because if you want to change stream in 12th then you'll have to repeat class 11th and this will lead to waste to a lot of time.
But if are not at all interested in science then please go for it.
Or you can change boards(like state board from CBSE) because some boards do allow you to change stream but please first clarify this thing and then if you want to change boards then you can do that.
Hope this helps!