Since you are interested to have a career of Software engineer, you must have a sound concept in Mathematics. There are two steps to proceed to the ultimate destination either you acquire a B.Com degree and later opt for MCA with a distinguished university after qualifying the written coupled with oral test or select the science stream in class 11 so that after passing 12 from CBSE or equivalent board, you can make entry in an engineering college where you would select computer engineering.
However to get admission in a coveted Institute, you have to clear one of the competitive tests such as IIT or any examination organised by the state level engineering test. You need to show sufficient interest in both Physics and Chemistry with a special focus in Mathematics so that you can crack the competitive test with impressive marks in order to get admission in your chosen field. There is no way but to put your effort consistently to crack the test.
In case, you have any aversion for Physics and Chemistry, pursue for B.Com and later acquire MCA from a reputed Institute. However, keep this thing in mind that Mathematics must pursued up to class 12 so that you should be eligible for admission in MCA.