Here is the course grade formula for calculating your grade in invertebrate paleontology

Course Grade =  (Midterm Exam)(0.20)  + (Essay )(0.25) + (topics, outlines, drafts)(0.10) + (Lab)(0.25)* + (Final)(0.20)

You can play around with scores to see what minimum you need on the final or in the lab quizzes or lab report to get you to your target grade.  For Example, suppose you had the following grades...
 
Example Course Grade = (Midterm exam 85)(0.20) + (topics,outlines,drafts 90) (0.10) + (Essay  83)(0.25) + (lab 75)(0.25)+ (Final ? ) (0.20)
 

That is 66.3% before the final exam.  Suppose you get an 86 on the final exam.  That will give you an 83% for the course (a B).

* How to Figure your Lab Grade for the course grade formula

There are 6 quizzes, each worth 20 points, totalling 120 possible points.  What % of 120 points did you get? multiply that by (0.25)
There are 13 in-lab assignments, ranging from 10- to 20 points, totalling 380 possible points.  What % of 380 did you get?  multiply that by (0.3)
There is 1 group lab report, graded out of 100 points.  What % of 100 did you get?  multiply that by (0.2)

There is 1 lab final, graded out of 40 points.  What % of 40 points did you get?  multiply that by (0.25)
Add them up (in-lab assignments %  x 0.3) + (quizzes % x 0.25) + (lab report % x 0.2) + (lab final % x 0.25) and put that final number into the course grade equation

Example:  Suppose you had the following grades...
earned 95 of 120 quiz points, which is 79%  and (79)(0.25) = 19.7
earned 353 of 380  in-lab assignments points, which is 93% and (93)(.3) = 27.9
earned 85 of 100 lab report points, which is 85% and (85)(0.2) = 17
earned 34 of 40 lab final exam points, which is 85% and (85)(0.25) = 21.2
So, total them up (19.7 + 27.9 + 17 +  21.2 = 85.8  and that is your lab score.  Put that in the course grade formula above.