No the IELTS is not an absolute necessity to take the AMC
The other acceptable english language tests are:
A pass in the Occupational English Test (OET) administered by the Centre for Adult Education with grades A or B only in each of the 4 components
A pass in the English language component of the United States Medical Licensing Examination [USMLE – previously ECFMG] but not the TOEFL component of the current USMLE
A pass in the Professional Linguistic Assessment Board (PLAB) examination in the United Kingdom; or
A pass in the English language proficiency component of the New Zealand Registration Examination (NZREX).
These English language proficiency standards will apply to all applicants for assessment through the AMC.
This would be advantageous to someone who has eg passed the PLAB and has an outdated IELTS score (ie more than 2 years old) or someone who is simultaneooulsy preparing for the MLE
Whichever english language test you choose to take it has to be taken before the AMC1
I would suggest you to contact AMC directly to be sure. Below is a note from the AMC.
PROVISIONS FOR EXEMPTION
A provision exists for applicants in certain circumstances to be granted an exemption from the requirement to pass one of the designated vocational tests of English proficiency. Applications for exemption must be submitted to the AMC using Form E or Form AON-E.
As the English language proficiency standards are now a requirement for registration, the AMC is not able to set aside these requirements without compromising a candidate’s eligibility for registration. However, the Medical Boards have retained discretionary provisions and may be able to accept alternative evidence of English language proficiency. If you consider that yours is a special case, contact one of the State/Territory Medical Boards to see if the circumstances of your case would qualify for an exemption from the agreed national standards.
If the Medical Board is prepared to grant you an exemption from the English proficiency standards, the AMC will process your application, on receipt of written confirmation from the Board.
State and Territory Medical Boards have indicated that for the purposes of registration:
icon_arrow.gif Results must have been obtained within 2 years prior to applying for registration
icon_arrow.gif An IELTS (or approved equivalent) Test Report Form more than two years old will be accepted as evidence of present level of ability if accompanied by proof that a candidate has actively maintained employment as a medical practitioner in a country where English is the native or first language.
Regards