Hello, i'm studying 11th grade in an european country that I will not specify for the second year. English is not my main language, so there will probably be many orthographic mistakes, but I hope the text will be understandable. From 7th to 8th grade I had good grades in maths effortless, but I must say that I couldn't understand some things without a familiar's help. I even scored near the 95th percentile on the Math and Science parts of the PISA test for the country I live in. But when I passed to 9th grade I hardly got a 6 in maths (guess I was putting effort, but maybe not enough), this contrasts with previously obtained results. All this went worst on 10th grade, when I just couldn't understand almost nothing on maths and failed to pass the subject. My grades brought down in most subjects because I was studying very little. With respect to physics and chemistry (we study it as a single subject), I could study a day before or even 30 minutes before and approve but I acquired a really poor base. When I passed to 11th grade I just was completely lost on the subjects I talk about and I got depressed for that and other things that were happening in my life. Finally I repeated the course because I suspended to many subjects. This year I failed those subjects again. The last three years I have had anxiety when studying mainly maths and physics, and I just can't stand it. Now I really want to understand those subjects (I wasn't interested before), but I don't know what is my problem, something is just going totally wrong. I don't know if we have bad books, a bad teacher (most of us can't frequently understand what he's explaining), if I don't put enough effort (that is sure, but I don't think it's the only, or at least, the main problem), if I don't study in the way I'm supposed/expected to study those subjects, If i'm just not enough intelligent for it, or a combination of many of those factors. I need to say that there are exams of those subjects that suspend most than 75 percent of my classmates, this leads me to think that the problem might not be exclusively or even mostly mine/our. I think I'm quite good at reasoning and argumentation, what is very important at math and physics, but I fail to understand it. For example, I don't understand such things as why N m2 kg−2 in G=6.674×10−11 N m2 kg−2. Or even why Newton's law of universal gravitation is how it is. Maybe I'm trying to understand it too deeply for my level, but I just can't stand memorizing equations without really understanding why they are how they are and what they mean. I think also that I study too slowly because sometimes I need 1 hour per page. I just try too analyze everything I read and there are too many concepts and too many relations among them and hardly can "play" with them. Other important problem is that I would like to study a degree related to those subjects and my results really discourage me. What do you think about all this things that I have exposed? what is the problem? what should I do? Thanks.