Won't all the new school buildings that have been built recently help this?
yes, and no. There is an overpopulation in the current two-shift system for elementary schools. Therefore, most of the new physical space is really just taking the overflow from students who are already IN the system. In our district, there are something like 5,000 kids without seats in schools (and we're not talking about high school kids who have voluntarily left the system, this is the "primer ciclo" which is kindergarten through 3-5th grade).
The whole schema has been readjusted -- kindergarten is now government sanctioned (before, school started for the public system in firstgrade). The first "cycle" of elementary school will be 1-3rd, the second 4-6th. A middle school level has been created for 7-8th and high school will be the same (four years), but with more of an emphasis on skills training (politecnicos). The 7-10th grade will be together and 11--12th grade will be together. There is a lot of research for this structure and I think it will actually help a lot at the elementary or basic school level.
The second part is the new curriculum. It is really progressive, and if they keep working on it, it WILL change the face of education here. It is a constructivist, student-centered approach with more focus on "investigation" and "process" than on outcome. (which, to be clear, does not mean that the outcome is not important, it just means that students are left to work-it-out and become problem solvers. Obviously, the goal is for them to give adequate answers/solutions, but developing the skills to get there (try, try again!) is also important.)
I am the first skeptic. I've had a TON of problems with the ministerio since this has rolled out because of the way it is being implemented and I have a big mouth and don't know how to keep it shut. BUT, I do believe they are going in the right direction. If they can continue to work with teachers AND students, it will slowly change for the better. Our neighbor school (which is a huge mess of tanda-extendida and politics mixed together) is really working on educating the parents and looking for partners to help train their teachers -- the desire to change is there, we just need help getting there.