Need advice in honors physics!

Ok, before I say anything, don't get judgemental. I'm on a medicine that gets me extremely tired at random times so studying is hard to get started on and doing homework is hard because I'm so busy right now as a junior taking AP's and all sorts of other things at my highschool. Now that that's over with, I need help with something. The second quarter of my schoolyear just started and I the very first grade (embarrasingly) is a quiz that I got 1/5 (20%) quetions right on because I just had no idea that we were going to have this quiz ; it just slipped my mind. Now, I will probably have another lab grade get added on there which will probably be around a 75 because I have very incompetent lab partners and I have no other friends in the class so I just have to deal with these people. If you've lasted this long, what I need your help with, is that I need to know how high I need to score on quizzes , tests , and homework in order to get at least a B- in my next quarter grade just like I got a B during this quarter, knowing that homework counts for 20 percent of the grade, quizzes for 30 , and tests/labs for 50 percent. In conclusion, how much do I have to do in order to catch up from this very low point? is there no chance for me to get a decent grade?

I will be judgmental to the extent that you should always do the best you can.
Whether you are a genius or poor.
If instead you set a specific target for marks you either a) underwork and learn less than you should or b) overpressure and do less than your best on something else.

So forget the marks. Don't blame your partners or the tiredness or anything else.
Just do your best at all times. And I really do mean at all times.

Then accept the result with good grace.