I think I am the perfect candidate to answer Your question because when I was in class 11th My Physics was very weak and later It become my favorite subject. I can tell you what I did, try it if it works. I came across Concept of Physics and I read some Topics I was really impressed with the book because In the first reading itself I understanf=d almost everything. Problems of Exercise are very good for Practice later I read Newtons Law of Motion and I find it very Interesting so Just followed it and I got interested in Physics and then It becomes my favorite subject.