In most schools, it should be possible to take Commerce with Psychology and Biology as your elective (6th) subject. Commerce and Psychology are not typically conflicting subjects, and Biology can be a valuable elective depending on your career goals.

Universities typically require a minimum percentage in Class 12 for B.Sc. Psychology programs. The specific subjects required can vary depending on the university.While some universities might prefer students from a Science background (with subjects like Biology), many universities do accept students from the Commerce stream for B.Sc. Psychology programs.

I hope it helps!