Please start... pay will be revised if u got acca certified after.

What's the status of the application? Just CV drop off or interview already?

If it's just CV drop off then it can take a while because HR receives a lot of job applications everyday so there is a process for HR to review it first for vetting and then for the hiring manager to further review to decide if worthy for interview.

If you already interviewed, then it depends on how urgent they need the position filed and the number of other candidates that they still need to interview. Could be 1 week or a month - but you should have asked that question during your interview on when you can expect an update from them.

mid tier firm in kl offering min 3k, provided all acca papers are cleared
big 4 should be around 3.2k-3.4k

It's very basic, don't worry too much about it. You'll be put in a room and given an hour to do a few objective questions (mathematics, logic), and then write 2 short essays at the end (you can choose from a few topics). Nothing to fret about.