Like the others have said it is hardly likely that you could understand all of "physics" in one year but if you want to start I would say look on Amazon for cheap old textbooks to buy and read. I'm not sure how up to speed you are in math, so if you can understand calculus and differential equations then I think you can start with a basic mechanics book (personally I do not like the basic mechanics courses taught to undergrads) since it helps you get comfortable "doing" physics. After that I would say get an intermediate level mechanics text which is much more satisfying than the undergrad mechanics courses, I used Marion and Thompsons Classical Dynamics, I loved it at the time (there is a free version of it as a pdf online don't spend the $300 bucks since that is a total waste) then after that move on to Goldstein which is way more satisfying. The nice thing about Golstein is it is relatively short but beautiful and he has a lot of awesome references which you can also check out like Whittaker -Analytical dynamics, which is awesome but very old so it's interesting to see how the style of physics textbooks have changed over the years I personally prefer the old style. Then while studying the analytical mechanics topics (basic mechanics -> intermediate mechanics -> more advanced mechanics) you will probably want to study basic electricity and magnetism which is included in many undergrad textbooks, you could probably skip circuits and go back to them later, then look into Griffiths -Introduction to Electrodynamics again free pdf online and study that text it has a nice presentation and easy to understand if you take the time, but unlike mechanics where you can just go from basic to intermediate to advanced, you can't go from basic electricity and magnetism to electrodynamics to Jacksons -classical electrodynamics, before you study from Jackson which most students have to do anyways I would say get a mathematical physics textbook (Boas-Mathematical Methods in the Physical sciences (free online pdf) or Arfken-Mathematical Methods for Physicists (free as pdf)) while studying the mathematical physics I would say also check out Gibbs-Vector Analysis to learn vectors from their creator. Once you do that you have to go back and study Griffiths again while readying a special relativity book (I don't happen to know any good ones I used Koguts and it was alright I didn't really pay attention in that class, but once you do that then you can try Jackson. While doing intermediate mechanics and Griffiths Electrodynamic stuff you can start studying quantum mechanics, I used Griffiths -Introduction to Quantum mechanics and I loved it at the time (it is free online as a pdf) but then when I prepared for grad school I read Albert Messiahs -Quantum Mechanics and I fell in love with his text, it gives you a history then starts with wave mechanics and then does some matrix mechanics (Schrodinger tells us they are equivalent!) this text is also free online as a pdf but I think you should purchase this text since it is just classic! I also went through sakurai-modern quantum mechanics (also free online as a pdf) which is more matrix mechanics so it is great learning from both styles. However you might want to learn Linear algebra. I used David Lays Linear algebra and its applications but that is just a introduction to the subject I found Shilovs-Linear algebra (a dover publication so it is very cheap) to be amazing, at first it was hard for me to understand it but then one day I read it and it all made sense to me and I just wish I could get an original hardcover copy of it. Hmmmm what else oh and you will need to learn thermodynamics which is taught in intro physics textbooks but you will probably want a more advanced text on it because they are more satisfying but I don't happen to know since I haven't found one I like but you ask anyone they could tell you theirs. Also if you live near a college you probably could pretend you are a student and just walk into the physics department and ask a random professor questions if you can't figure something out. I know a lot of the people say you can't do this in a year but as physicists we should realize a lot of things are possible and however unlikely this is, you can do it depending on the circumstances. Best of luck to you.
