@pmond meron lang playback dun sa mic testing part before start ng exam. I remember hindi yun one time lang pero hindi rin naman unli. Use it to adjust your mic, saan yung position na clear at less puffs of air yung marerecord. It's recommended to hit next every after item kasi may tendency na mapick up ng mic mo yung sinasabi ng katabi mo which couldve affected your oral fluency and pronunciation.
For practice, pwede mo irecord yung sarili mo but impt na marecognize mo yung areas for improvement mo. Another way to assess your pronunciation is to try speech to text apps sa phone. Check mo kung narerecognize ka ni google or siri pag nagsalita ka.