Yes, you can apply for the Bachelor of Computer Application (BCA) program at Dr. B.C. Roy Academy of Professional Courses with a Higher Secondary (H.S.) qualification that includes Mathematics. The eligibility criteria specify that candidates must have passed or appeared in the Higher Secondary Examination in the General or Vocational Stream under the West Bengal Council of Higher Secondary Education or its equivalent. Preference is given to students who have studied subjects like Mathematics, Statistics, English, Business Mathematics, Computer Science, IT, Information Practice, or Computer Application at the 10+2 level. Therefore, with your H.S. qualification in Mathematics, you meet the eligibility requirements for the BCA course.