stupid question, but what do you mean by "long" anything?
Oh. So in our high school system (or upper secondary school etc I'm not sure which one is the most correct one ) everyone must do a certain amount of math courses, a certain amount of physics courses etc). And you must graduate at least four subjects.
Basically, long maths is a longer version of maths. Everyone must study maths at least six courses, but if you want to continue maths at uni, or you want to have a profession that deals with maths, you must take long maths, which takes more effort and time and is generally deemed as the hardest part of high school.
when it comes to physics you must take at least one, but if you want to continue them at uni you need six. Etc.
So basically what I choose now affects what I can study at uni. Hopefully I make sense, I do not know the equivalents to these terms in English and besides our systems are different.
In a nutshell, everyone must take short maths, short English, short physics etc. But if you want to continue English, or physics or maths at uni, you need the longer ones.
And my problem is that you can't have everything and I can't decide what to drop. Since it is impossible to have long everything and still manage to graduate in three years.
Usually people concentrate on those subjects they are good at, but I'm fairly good at every subject and if a math teacher comes telling me that I'm very talented and could pretty much get the top grades at maths, I find it hard to tell her that I plan to drop long maths completely.
But trying to do long maths and long physics and also long English, long psychology, long literature and long history is pretty hard. Possible but takes a great deal of work. I could do it but I'm not sure I want to.