If you're aiming for a future in psychology, both Business and Chemistry can offer valuable skills, but the choice depends on your interests and how you want to approach your psychology studies. For example, Business (Edexcel AS Level), could be beneficial if you're interested in the organizational, marketing, or management aspects of psychology, such as occupational psychology or running a private practice.
Chemistry (Edexcel AS Level) would also be more relevant if you're interested in areas of psychology that overlap with the natural sciences, such as neuropsychology, pharmacology, or any research-based career in psychology.