The real deadline for IAs and EEs and all that stuff are March.....talk to your school, you havn't failed yet. And if you still wanna fail IB, don't fail the IA, it's the one thing which causes the most problem. Apparently your IA grades can be carried over, but your exams can't. So if you wanna retake IA, you'll have to redo the exam. Your IA would have to be done under your teacher's supervision, meaning you can't move school.
So you have 3 months. Do it, put in some work, get it over with, don't prolong this agony.