中三 轉校還來得及嗎 :)))

中三
轉校還來得及嗎？(urgent need to know )My daughter is studying S3 and will need to choose subjects for S4. She is a non-chinese student( NCS) and will take the local exam DSE 3 year later.
Her school cannot let her chose Bio and Economic together, so can anyone please give me some information about the following:

!. Are there any B1 schools can let students choose