There are four types of offer which will appear in Track.

Interview / Further Testing

Some of the more competitive courses require further testing or submission of evidence
(eg medicine, dentistry, art etc).

This is now becoming more commonplace and some universities are now introducing further testing for courses such as Humanities (eg English, History etc). 

You should ensure you are aware of these requirements BEFORE submitting your choices and prepare for these in plenty of time.

Some establishments prefer to interview candidates prior to making an offer.

It is useful to arrange a mock interview beforehand if this is the case so you should speak to your PCS teacher or a subject specialist who can arrange this for you.