can you get an offer with low predicted grades?Watch
As a general rule if you are applying for courses with entry requirements two grades (or more) above your predicted grades (and never in a specified subject), you can expect a rejection. Many Unis will consider applicants one grade below their requirements (depends on course and Uni) but that is still risky as your application will score lower than someone with the right predicted grades so you will not be a priority for an offer.
One option is not to apply for UCAS this year. Work your socks off to get the best possible grades you can ('I'll show them'), and apply next year with known grades Then you are not relying on predicted grades at all.