Hey hi

(Don't worry I haven't forgotten).
Trials. Well can you say which team the trials are with ? Maybe PM me (can't remember whether you said you were Sydney based or not). Might be a club I know well, hehe.
Aside from that, there's no way of knowing what clubs are looking for. In theory, they will look at all players equally and base their selection on the best players they have, position for position, in relation to what they see in front of them.
However, knowing the way it works around NSW ... I know that for many clubs, that is a load of bollocks. Some pick for strength and speed, some on individual ball skills and dribbling, some on reputation, some on fitness, some pick people who can score, some ... ugh, there's just no way of knowing. So how can anyone suggest anything ? Well, here's my experience:
*They might do a multi-stage fitness test (beep test) or a 12 minute Cooper run. Not common, I know when Northern Spirit were selecting one year they did that.
*If it's a Premier Youth club you're trialling with, the chances are, if it's a top club, that they've already ear-marked who they want and have requested that they trial. It sounds harsh, but I'm afraid years of experience in this field has shown me this is true. So you'd have to be a stand out to make them look at you. Like I say, I don't know what club or level you are talking about. You mentioned Super Youth I think.
*They may do skills and set practices. I saw one trial where they stuck about 25 kids in the penalty box and played half vs half with a keeper in the middle. It was utter mayhem. Then they took everyone out after 20 mins and ran a crappy shooting drill. From the shooting drill they selected the players they wanted. It was noticable, that the ones they selected, kept missing the target. I've no idea whether that bore any relation to anything, but there you go. (That was a top NSL club by the way !!! Fell from grace though, and you can see why). The best player and striker of the ball at those trials was never picked. Since then, he has gone on to far greater things. (So don't despair). Some coaches have no clue what they are looking at.
*Sometimes it will just be a trial game, 11 v 11. You may or may not be in your favoured position. Might be 3 teams of 11 rotating.
*Sometimes it'll be different drills or a circuit of drills, and a game perhaps.
*Some trials will split trialists into different pitches, 3 pitches for example. There will be the definites vs the probables, then the possibles vs the possibles, and the 'if his dad pays us loads' vs the no hopers. Coaches will watch and move players up or down accordingly. Sometimes they tap you on the shoulder and ask your name. Then at the end, they'll either say:
1. These people are through to the next round of trials <list of names>
or
2. You'll get a phonecall/letter this week, if you don't get a letter, assume you've been unsuccessful.
or
3. They'll just pick people out and sign them in front of everyone.
or
4. Everyone will come back for another trial.
My advice:
1. Play how you naturally play, don't try and play differently. You have to go on the premise that the coaches are good and they know what they're looking at.
2. Ignore all the coaches and people watching you. Hard I know, but concentrate on your game, even if they tap you on the shoulder, don't think 'yes I been noticed' just keep going, they might be tapping your shoulder to elliminate you from their list, or to add you, you never know.
3. Try and show your full range of skills as much as possible, without showing off though, if you see what I mean. As a coach, I look for players with ability who can do more than just dribble, or shoot. I look for rounded players and decent selectors should be too. Show that you know how and when to pass, tackle, close down, jockey, mark, attack, defend, carry the ball etc.
4. Be confident in your own ability, and comfortable with any position they put you in. A footballer should potentially be able to play any position. It's the same games, same skills, just in different proportions. For example: If you're a RM, and they stick you at RB, don't think 'ugh, i hate defence'. Just concentrate on what you're doing, play your RM into the game the same way you'd be played in, and get forward at the right time and show what you can do. RB and RM are not that different a position in attack, or defence, not really (there are key differences of course).
5. Show you can cope with the physical side of things. Coaches want people who can take knocks and put themselves about. Not violently (well, some do), but competitively.
6. Treat it as fun, don't take the whole thing so seriously. Enjoy what it is you are doing. Sometimes players actually do better if they think they've been cut already, they then relax and play better and are surprised with selection. hehhe
7. If you are not selected, don't think, 'I'm crap, I'm never going to get into a club' or whatever. Chances are, the coaches didn't know what they were looking at (if relevant), or they never saw you (luck, although no excuse on their part), or you didn't have the right attributes for their selection criteria. It is not personal.
I'm sure you will be fine. Like I said, if you are Sydney based, let me know what club and I might be able to be more specific.
Good luck. (been to many many trials, I know it can be daunting)