Is there any point in applying to OxBridge with a 34 in IB?

Extensive Reading, awesome statement, additional A Levels, learning a new language, perhaps voluntary work at some department (who knows) ...

For Oxbridge you can probably only gain additional qualifications, ring up all the colleges to see, where you might have a chance to be considered, relax and fill up your year with stuff which benefit you long term, not depending only on Oxbridge.