It is, the top 16 advance. Places 9-16 swim in a B-final and the top 8 swim in the A final. If you are 9-16, you can place no higher than 9th for the team points stuff. Top 3 from the A final are your 1st,2 nd, and 3rd place podium finishers.
For ages 13-14, they don't swim 400M events twice in a day. So everyone who qualifies for the event will be placed in heats and they'll swim the 2 slower heats (based on qualifying times) in the AM session and what they call the "fastest heat" in the evening. Your time in those events determines your placement for final standings. For instance, on Saturday AM my daughter swam the 400M free along with 2 of her teammates and 5 other girls in heat 2 (the slower qualifying times). My daughter cut 12 seconds from her entry time (which was recorded 2 weeks ago). Her 2 teammates cut 27 seconds each (that was just ridiculous) and because they went so stupid fast in this race, they ended up actually finishing 7th and 8th respectively.
In all, my daughter had a good meet. She cut time in every event and made at least 3 more 15+ state qualifying times. She's also maybe a second or two away from recording some "A" standard times which will open her up to some more regional meets. Crazy thing is she could identify areas of her swims she needs to fix.
She swam the 200M backstroke on Saturday, in the AM and then as part of the B final in the evening. Both times she slipped off the starting block and so she didn't get the start she wanted. The AM slip wasn't quite as bad. The B final slip was brutal and she found herself behind the pack by 5 meters in the first 25. For anyone not familiar, the starting "block" for backstroke is a slat of plastic or rubber about 2 feet wide, 4 inches tall and 1/2" in depth. You're supposed to grip the slat with your toes. Well, when gearing up for that push back, her foot slipped. Anyway, she recovered nicely and finished 4th in the B-final and she really recovered well and she ended up cutting almost 4 additional seconds off her prelim time...and the time in the final would have actually qualified her 6th for the A-final.
Sunday she only swam the 50 back as the leadoff in the 200M Medley relay. She swam one of her fastest backstroke 50s to date. She's got some time off from swimming for about 3 weeks before the resume practices for short course. With that break, she's going to train for a mini Triathlon. Last year she finished 2nd in her age group of about 40. She's gunning for first this year as she has committed herself to actually do some running (she hates running...she can probably swim the mile faster than she can run one

)