Repeating first year of IB??

Hi everyone!

Im considering repeating my first year of IB because my predicted grades are not up to my expectations. My current grades are:

HL: Chemistry (6), Biology (6), Economics (5)
SL: French (5), English LangLit (5), Maths (6)

This would add up 33 points but if i want to apply to any top university i would definitely need a score above 40. This year was really rough for me because of many family problems. So I want to repeat this year at another international school in a different country. I would be able to get significantly better grades (at least a 40) if provided an extra year… My dream school is uchicago and I have to get in there. I was just wondering if repeating a year would hurt my chances in admissions.