topis that u hv to present to e panels will be your teaching subject1 that u've applied during your online application. MOE will email u saying scheduled for interview for eg Maths (Sec) so u will hv to go to MOE website & check out the syllabus for Maths (Sec) & from there choose a topic to present eg algebra or quadratic eqns. Topic that u choose to present must be in the MOE content syllabus (don't choose wrongly) as the panels are very senior educators like Principal, Superintendent or from CPDHQ. My advise is to choose something simple, what they want to see is that u got e confidence to present in front of e class (not soft) & how u manage rowdy students as sometimes e panel will disrupt e class by making noise or throwing paper around so u got to show them that u are in charge.
The most important is to remain calm & potray confidence - voice projection is important here - be clear & ensure u're loud enough.
Btw when is your interview, for what subject/level?
All e best.