Italian, 25, social sciences degree... do I have any chance?

Oh, just some more info: I practiced several sports at junior level (I qualified 4 times at Track & Field Italian championships at Junior Level).
I can get very good letter of reccomendation from both professors and employer (from the local company which hired me as intern).

I'd like to know if you believe that with adequate preparation I can reach 650 mark on GMAT.
When I scored 620 on the practice GMAT, I scored 42 on Math and 35 on verbal, or smething like that.

I'd like to work in the consulting field, I'd love to! But also being an international manager or a real estate company manager would fit me very well!

Thanks again Stacy!!

Hi Stacy,
and thanks for your answer. May I bother you just another time?
I thought about the possibility of working a couple of year in order to have better chances of admission, also to other schools (like Rice, Brigham Young, i.e.). But I fear the job I would get with my BA wouldn't enable me to get any really relevant position, anything I would have to be proud of write about on my resume I mean. I could get a job in a local firm/cooperation working in the cleaning sector (where I did my internship): in this case, what position would you apply for?
As you have seen, I'm considering applying to B-Schools whose admitted students have a low amount of work experience: do you think that a GMAT averaging other admitted students and an above average GPA will help me being admitted, should I decide to pursue my MBA without waiting?
Thanks a lot again for your help!
Sincerely,

Roberto