Hi, I've read through the thread, but I was wondering a few things. Would you be able to pick up ag in 6th year and do decently in it? I do 8, but I'm dropping History and I need 560 points for my first choice course, with two pass subjects. My school offers it, and the teacher said he wouldn't have a problem with me joining, but I'm worried I wouldn't be able to do the course well enough?
Next thing to do: Go to examinations.ie and have a look at some of the exam papers and get a feel for the subject. If you are doing Biology or Geography there will be some overlap.
After that if you decide to do the project let your school know you are changing over. Ask the ag science teacher what project work he has already assigned and get on top of it over the summer. Get a book. Ask him what sections of the course he has done and start doing some work on them so you are up to speed as much as possible when you come back in September.
A lot of people do ag science in one year. It's a favourite in grind schools (although I'm not a big fan of the grind school system). Even if you got the biology side of things out of the way and revised over the summer you would have a good bit done (plant physiology, animal physiology, genetics, microbiology, ecology, soil science).
If you are not from a farming background, sort out where you are going to go to get the experience and information needed for your practical project.
Buy a grow bag and some seed potatoes this week and plant them. Take photos and continue to do so over the summer.