For the teaching program I am targeting, do I need to score seven bands overall in IELTS regardless of the field, such as accounting or others in Australia/New Zealand?

No, you do not need to score seven bands overall in IELTS for all fields.

For teaching programs, especially in Australia and New Zealand, the IELTS requirements are higher:
- Australia: Typically requires an overall 7.5 (with no band below 7.0, and at least 8.0 in Speaking and Listening) for teaching programs.
- New Zealand: Usually requires an overall 7.0 (with no band below 7.0) for teaching programs.

For non-teaching programs (such as accounting), the IELTS requirement is generally lower, often between 6.0 - 7.0 overall, depending on the program and university.

Always check the specific requirements for your chosen program and country, as they can vary.