My blood pressure is 93-56. So the doctor asked me if my blood pressure 93-56 has any effect?

I have high blood pressure. The doctor told me how to treat grade 3 high blood pressure

My mother is 90 years old this year and is currently taking prescription blood pressure medicine: 1v Stadovas 5mg in the morning, 1v Pyzacar in the afternoon, but her blood pressure is still at 150/100. So please ask the doctor who should take medicine for high blood pressure? Can my mother change to 1v COVERSYL 5mg in the morning and 1v PYZACAR 2.5mg in the afternoon? Ask your doctor for advice. Thank you very much doctor.