i failed my chemistry test I got a 11% on it, but then i got an 83% and a 70% 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%?

Assuming each test and assignment is weighted equally, your current grade can be calculated as follows:

(11% * 70%) + (83% * 10%) + (70% * 10%) = 7.7% + 8.3% + 7% = 23%

To finish the class with an 85% overall grade, you would need to earn an average of:

(85% - 23%) / 3 = 20.7% / 3 = 6.9%

Therefore, you would need to earn an average of approximately 7% on each of the remaining 3 unit tests and assignments to achieve an 85% overall grade.

To finish the class with a 90% overall grade, you would need to earn an average of:

(90% - 23%) / 3 = 67% / 3 = 22.3%

Therefore, you would need to earn an average of approximately 22.3% on each of the remaining 3 unit tests and assignments to achieve a 90% overall grade.