Your son can continue with science in Class 9 and 10 under the ICSE board, focusing on subjects like Physics, Chemistry, and Biology, but mathematics is generally a compulsory subject in ICSE, so he will still need to study it, even if he struggles with it. If he plans to switch to the CBSE board in Class 11, most schools allow students to choose the PCB stream without mathematics, though some may require a minimum percentage in Class 10 to confirm eligibility, so it is important to check with the specific school. For pursuing a career in medicine such as MBBS or BDS, mathematics is not required, and the focus remains on Physics, Chemistry, and Biology, although having basic mathematical knowledge can be helpful for certain entrance exam questions. Dropping mathematics entirely will not prevent him from pursuing medical courses, and it also opens up alternative career paths in fields like biotechnology, environmental science, psychology, and nutrition, which emphasize biology and chemistry rather than mathematics.

Yes  your son can drop Maths in Class 9 & 10 and still choose PCB (Physics, Chemistry, Biology) in Class 11 for medical stream.

CBSE schools allow admission to PCB without Maths if he passes Class 10 with Science.

To become a doctor, only PCB in Class 11 & 12 + NEET exam is required, Maths is not compulsory .

More details: NEET Exam Guide – Careers360
For future college options: NEET College Predictor