Hi there.

I am assuming that you are asking about which subject combination you should choose with Psychology as your major/core subject.

See, to be very honest here, in the long run, your general subjects won't matter at all. All you need is to have good and sound knowledge of the core subject, in your case, psychology, to have a brighter future. 

For the sake of your question, I would suggest taking Zoology as in Zoology you will be taught about the nervous system extensively that will help you a lot in your major subject.

Other than Zoology, you can take any subject available, from Botany, Physics, Chemistry etc. as none of these subjects except zoology are related to Psychology in any way.

Hope this helps. 

Good Luck!

Hey.

Here is a list of a few subjects which are included in Bsc Psychology Course.-

• Introduction to Psychology  
•  Attention and Perception    Intelligence and Creativity  
•  Motivation  
•   Stress and Well-Being  
• States of Consciousness  
• Memory  
•  Nature and Methods of Physiological Psychology
•   Nervous System: Structure and Function
•  Endocrine System  
• Nature of Psychological Research  
• Steps in Psychological Research  
• Hypothesis  
• Problem and Variables  
•  Experimental and Non-experimental Research
• Observation, Interview Methods  
• Qualitative Analysis
•   Quantitative Analysis  
• Application of Measure of Central Tendencies and Variability
•  Non-parametric and Parametric Statistics  
• Social and Cultural Context in Human Development  
•   Development Concerns during Adolescence, early youth and adulthood.  
• Social Perception and cognition  
• Inter-group conflict  
•  Theoretical and methodological issues in self and personality  
• Principles of Psychological Test Construction  
• Types of Psychological Tests  
• Assessment of Psychopathological Behaviour  

Best of luck