Ah I didn't notice your location there! If you're doing the IB the CAO operates a different points equivalence (CAO irish points) for that, so no need to bother about conversion into A-level grades.
This page is important
http://www.tcd.ie/Admissions/undergraduate/requirements/matriculation/other/And here's the IB bit
http://www.tcd.ie/Admissions/undergraduate/requirements/matriculation/other/#international-baccaleureateAs you can see, the points equivalence is pretty handy. Total grade/45 x 600.
You will need to get 40 I'm afraid, 39 falls right below at 520. 40 gets you about 533, perfect. 35 is too low, it is about 467.
You can resit, but you need to basically resit the whole thing, all subjects. You can only take the grades and points from one of these sittings. ie. you cannot mix and match subjects done in different years. This is because the Irish Leaving Cert doesn't allow this- it's repeat all 7 subjects or nothing.
If you're applying as an EU student then the fees are the same as home fees, €2000 a year.
It's not a glitch. You can apply for 10 courses at Trinity, or any combination of Irish unis...so ten courses in five unis, or whatever. Most fill out the form, but you can leave it at 1 or 2 if you want, so it's pretty open. They need to be in GENUINE ORDER OR PREFERENCE, and NOT what you think you're capable of getting. That's the most important thing as if you undersell yourself and end up with enough points for your favourite, if you haven't put it at the top you won't get it since you'll have enough points for whatever you put first. They will never offer you a course lower than one you fulfil requirements for and have the points for.
The CAO handbook is here
http://www2.cao.ie/handbook/handbook/index.phpYou can see the pdf of 2011 CAO points here.
http://www2.cao.ie/points/lv8_11.pdfIt's the first column of points that's the most important, the second one is just what the average student on the course got. An asterisk means it's very competitive and will use random selection. Trinity is a bit of the way down.
Are you interested in BESS at all? It is business economics and social studies. The first year is general and includes things like maths and statistics BUT you can have it as pure economics in your final year and graduate as that. It's very versatile and extremely well respected. It's also lower points, it hovers around 460 I think.
Aside from BESS and PPES, none of your other choices will appear on that points list, because they are TSM- two subject, and impossible to calibrate points for properly. English and latin will be the lowest, in the 400's. The ones with economics will also be in the 400's, higher than latin though. English and history is probably the most popular combo and as a result hovers around 510-520, so you would still need 39 in the IB for that.
I would not really be able to rank York fairly on those subjects. I know that Trinity excels in them, I can't really speak for York. Trinity ranks higher overall though.