1) You definitely will qualify for TS since you have ACCA, and that you are able to articulate your thoughts well during the interview.

2) With regards to exit opportunities, i have seen some TS peeps or Deals Advisory peeps (what pwc calls it) move into investment banking. But this is rare as the amount and quality of work in TS in BIG 4 is not comparable to a full fledge investment bank like Maybank or CIMB. To increase your chances of getting into investment banking after TS, get a CFA.

3) Aside from Investment Banking, some peeps in the field also managed to secure Big 4 placements in overseas such as Australia and Singapore.

3) Or you could enter commercial and join the finance department.

4) or move into management consulting or strategy consulting like mckinsey, bain, bcg. Again, this is very tough due to their vigorous case interviews process

In the end, exit opportunities for corporate finance (CF) peeps in BIG 4 is abundant. Although the level of CF in BIG 4 is not as robust and intensive as a full fledge investment bank, it is still sufficient to grant you some high paying job opportunities in the future.

Get an internship experience in TS then before converting to full-time. I would highly recommend you to network with recruiters and make it clear you want an opportunity at TS.

Or

Like what u said, join audit and ask for a switch to TS after a few years. Its quite common, in fact one of my supervisor did this. She joined audit, got her acca, then transferred to TS after a few years as assistant manager.

Which firm did you try to get into for advisory? Failed assessment/interview or just no reply? On ur internship its more likely that they would prefer students for internship. Why not apply for a permanent role right away?

It depends on availability in the dept and ur position I think. Which firm are you in and what dept is it?

Which firm will u be working at? Are u a fresh graduate? Or joining as a second year associate?