A boy who wants to be a politician.

What intrigued me today was a student who said he wanted to be a politician! He usually belongs to the mid-low level on almost all subjects except history and social studies. He concentrates only for <em>(use "on") </em>these <em>(subjects is plural so the article needs to be plural)</em> subjects. In this point <em></em><em>("the</em>se <em>classes</em><em>" again the subject is plural.) </em>he is way <em>("very</em>" <em>using way isnt incorrect, and is colloquial, but in writing it is strange to say this) </em>brilliant.
I said "YES you sould!" Then he seemed so excited about his future and I was so happy to see the someone <em>(articles are not needed when using "someone" or "something") </em>who is able to have a big dream in at his young stage <em>(use "age</em>"<em>)</em>.
I hope his performance increses step by srep step. Can't wait to see his improvement.

Your english is very good.

..

I said "YES! You should!".

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Just adding to Ian's excellent correction above. A simple little spelling mistake ;)