Hello STudent

Yes you can change your stream from covers to science after 10th class. You have to pass all the subjects with at least 75% marks 10th class examination.but  it may be difficult for you to continue with science in intermediate 11 and 12 class examination because the subjects are related in intermediate course of science , perhaps you may not be acquainted with all the subjects in your class 10 examination. So do change the stream after class 10 from commerce to science you have to think well of all coroners and pros and cons of science stream and after that take decision of changing your stream from commerce to science