@katniss2015, as per CPAA website:
https://www.cpaaustralia.com.au/member-services/fees/singapore
Migration assessment Fee (AUD)
Skilled migration assessment $473
Skilled migration replacement letter $73
Skilled migration review or appeal assessment $145
Skilled migration assessment withdrawal $73
Skilled migration assessment update $145
Updating your skills assessment
https://www.cpaaustralia.com.au/become-a-cpa/migration-assessment/how-do-i-apply
If you have obtained a provisional skills assessment from CPA Australia and are now ready to update your outcome to obtain a full skills assessment for general skilled migration, you can download and complete the Supplementary services application form (PDF). This form will need to be posted to us as PDF application forms are not accepted by email.
You can also use this form to request an update if your initial assessment outcome was unsuccessful and you have completed additional studies or English tests that you would now like considered.
You will need to apply for a new assessment application if your initial skills assessment is no longer valid.
Appealing or reviewing your skills assessment
If you have obtained a skills assessment from CPA Australia, but you would like to request an appeal or formal review of the assessment outcome, you can download and complete the Supplementary services application form (PDF). This form will need to be posted to us as PDF application forms are not accepted by email. CPA Australia will consider requests to review an outcome up to two times after the initial outcome is issued.
Form:
https://www.cpaaustralia.com.au/~/media/corporate/allfiles/document/become/migration-assessment-supplementary-services.pdf?la=en