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Yes you can CA after 12th Science. There is a foundation level course called CPT. you will get all the fundamental knowledge in this CPT classes. So you can easily enter into CA course.
For Appearing in CPT Exam First u need to Obtain Registration with the Institute of Chartered Accountants of Nepal (ICAN). After Registration Before Exam you have to Fill up Examination Form of ICAN. CPT Exam are held twice in Year in the month of June and Dec.
Also, Science students in general have more studying habits , so they can catch the fundamentals easily. So dont get afraid and join the course if this interests you.