Hello all, PF really is a great resource of physics, I'm glad to be part of the forum now. I'm 17 years old and now I'm waiting the start of classes at my university (obviously I chose physics :tongue:), so now that I have free time for around 3-4 months I want to improve my knowledge to achieve better results in the future. What should I focus on? I'm thinking about studying high school math because I haven't a good base yet but firstly I would like to see opinions from more experienced students. What are the best "introduction to physics" books without use of calculus? Thank you and sorry for my English mistakes, I'm not good with this language.