Need help with weighted grades calculation

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I can't quite see how to solve this, so help will be appreciated.

I want to see if I can ever recover from this situation and what my final projected grade could be based on this. I list my grade in each category and the weight it carries toward the final grade.

Grade     Weight

Lectures
51.06% ; 5%

Recitation
43.75% ; 10%

Tests
30.42% ; 30%

Online
42.10% ; 25%

Labs
_____ ; 10%

Final Exam
_____ ; 20%

My Total Average Grade at the moment is 42.11%

About what percentage in my remaining work would I need to reach 70%, if that's even possible? Note that I don't have exact numbers but we are approximately HAlfway through the semester, with a pretty even amount of work on each half. As for the Tests, I have completed 2/3 tests, so just 1 test with a weight of 30% left, if that information is relevant at all.

Thanks and please show me how you did it.