Many students are dissatisfied with the fact, that they 'should' (ja bym to dala inaczej...are made to) learn things they do not like and probably do not need in the future. 'And' (nie zaczynaj zdania z 'and' to nie jest jego funkcja na poczatku zdania) accordingly some high schools give their students the possibility to decide which subjects 'do they' (cos tu nit tak, to wyglada jak pytanie) want to study. There are certainly pros and cons 'of this solution' (to nie jest 'solution' to jak narazie jest 'discussion).
First of all, if (przedimek) student rejects some subjects, he can focus on 'these' (nie, bo tutaj by wygladali, ze on moze swoj focus dawac na te, ktorer on odrzucil, daj inne slowo) he is really interested in. For (a gdzie jest przedimek?) young person who 'want' (young person - he-3os.l.poj) to study economics it is 'wasting' (zle slowo) of time to learn about (tutaj wypada dac slowa 'na przyklad') 'inects'' (popraw) organs. 'Then' (to cos mi sie nie laczy, wiem, ze jak studiuje economics to maths jest pottrzebne, ale napisz to tak, zeby to sie laczylo)f he can devote more time to mathematics or geography. What is more, if he has less subjests to study, he can achieve (przedimek) better average grade. 'And' (prosze nie zaczynac zdan z 'and' - czy tak samo robisz w jez. polskim?) that would be helpful in university recruitment.
Even if someone 'have' (someone-he-3os.l.poj) 'choosen' (popraw) science it does not mean that he 'can know' (nie rozumiem tego, czy mowisz ze powinnien znac, czy to jest mu niepotrzebne) anything about his country's history. Further, after some time (przedimek) student can change his decision about the future and regret the choice of subjects.
All in all, there is some responsibility in choosing subjects to learn, 'but it can be good' (niby dla kogo? musisz to wytlumaczyc). If we choose something 'by our owns' (to jest calkowicie zle, tutaj pasuje 'ourselves') we are more motivated to 'extend it' (cos mi tu nie gra). For me it is better to be brilliant in one thing, than to know just 'in' (cos nie tak) sketch about everything.