No official document? IB prediction enough for Oxford?

Hey guys, I hope your hoidays have all been relaxing yet productive.
I have some questions about particularly Oxford.
My problem is that I came to England in Sixth Form and therefore have no GCSE's whatsoever. The equivalent in my country (Germany) is not official either but a grade which differs from school to school. On top of that my grades were not even good (equivalent to 3A*s 5 A's rest B's).
In Sixth Form in the UK I started doing the IB and I am now getting predicted around 43-44 with 777 in HL (which are Mathematics, Physics, Economics).
I am applying for Engineering Science in Oxford. I heard you have to do the PAT for admission and looking at the past papers I am confident getting a high score in this.
My questions now are:
1) Would it be a problem if I have no official document proving my ability? Will a 43 prediction and a good PAT be enough or are the missing GCSE's a problem?
2) Should I even include my grades from Germany since they are subjective too and not brilliant as I said?
3) Any other tips to increase chances?

Thanks a lot in advance guys!

1. No, Oxford knows that not everyone takes the GCSEs. Your UCAS form, predicted grade, PAT score and interview (if invited) are fine.
2. Oxford won't consider them as it only considers standardised exams.

Hey thanks for your quick reply! Are you sure about that? I wonder where you get this information from haha could you tell me?
Sounds very good though!

Hey thanks for your quick reply! Are you sure about that? I wonder where you get this information from haha could you tell me?
Sounds very good though!

Hey thanks for your quick reply! Are you sure about that? I wonder where you get this information from haha could you tell me?
Sounds very good though!

I know it's hard not to worry but if you think about it, it's logical that Oxford can't rule out applications from people who don't have standardised exams at age 16 - that would eliminate huge numbers of international applicants. If it helps, have a look at https://uni-of-oxford.custhelp.com/app/answers/detail/a_id/513/kw/GCSE - the question is specific to medicine but medicine is widely acknowledged to the course which weights GCSEs most heavily so if they are clear that you can apply for medicine without GCSEs, you can believe that it's OK for other subjects as well.

Simple logic. If you go to their page on International Qualifications, every single qualification there is a standardised exam. It stands to reason that since your GCSE equivalent wasn't standardised, it wouldn't be in that list.

And I know all the things you need because I've just applied last year myself, so I'm well versed with the application process

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How were your grades compared to others in your previous school? It might be helpful for your reference to briefly mention your academic history prior to joining your current school, especially if you were one of the top students in your previous school (regardless of what your grades were like).

also 43 points with 7,7,7 at HL is so incredibly strong (and not necessarily that common tbh; people have gotten in with only one 7 at HL) and with a strong PAT you would get an interview, and once you've got the interview, you're on your own. so i would say it's worth it.