Hey!
For your admission in B.A. Psychology (Honours), marks for best four subjects should be calculated as follows:
1. 55% or more in English
2. Combination of best three other subjects from elective subjects of Lists A and B
3. One of the above three subjects should be Psychology

Both physics and chemistry are included in List B (according to DU guidelines), so you can choose the subjects you mentioned for BFS % calculation. There will not be any deduction, don't worry.

Best wishes!