I agree with everybody who said that to study at a university level in Mexico your best bet is to get into a 4 year college, take 1-2 years of Spanish and then try to do a year abroad. You need to have an excellent level of Spanish to take university level courses (heck, I barely understood some of my University courses... and they were in English).
One piece of anecdotal evidence of the universities Spanish requirements. My Spanish school has a relationship with the Universidad Autonoma de Queretaro. They sometimes send us students to raise there Spanish levels so that they can do a semester abroad with them. Now the students who come for these courses are are not beginners. All are conversationally fluent, and very advanced Spanish students, but even that is not enough to take the University level classes. While they may understand the oral lecture, they need to have perfect Spanish to write reports and projects as well as understand the standards and norms of University Spanish. It is not easy.
Additionally, in Mexico there are no college loans like in the U.S. (and maybe britain), you have to pay for private universities in cash or with a regular bank loan. There are some scholarships, but I doubt there are many (if any) geared towards foreigners from first world countries (there are some that help students from central america that I know of).
This is not to discourage you from trying, but keep in mind that what you want is very difficult. Good Luck.
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