Question

i failed my chemistry test I got a 11% on it, but then i got an 83% on my assignment. My termwork is worth 70% ( tests and assignements), and then my exam is worth 30%. I only 3 units tests left, and couple assignement and my exam. My first question is what is hypothetically my grade right now ? What do I need on my next projects and tests and exam to finish the class with an 85% or 90%?