Classe365's Assessment & Grading Module offers the orgaization to have the flexibility to support various grading scales like Percentage, Grades, Rubrics, Manual Entry with Assessments.

If you want to know how to add assessment, how to setup weights please refer this documentation.

Now, lets begin calculating the overall of any suject.

Go to Grade Setup > Add Assessment Categories
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I've created 5 different assessment categories as shown in the snapshot.

The categories are:

If you want to know how to manage weights please refer this documentation.

I've created a Class called A-1, Section- Semester-2 and it has English subject with 2 students.

Now, for subject English we have 5 categories . Out of 5 we shall consider  2 categories (i.e, Class Test & Final Exam) so now we will add assessments to these categories and each category carries 50 points, hence the weight setup to this subject is as below:
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Weight is setup to English subject now, lets add assessments to these 2 categories

We can add assessments to these categories(i.e, Class Test Final Exam), which specify the grading scale, applied to subjects, enabling count towards overall.
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Now that we've added 4 assessments, to two assessment categories.

Category-1: Class Test has 3 assessments called:

Category-2: Final Exam has 1 assessment called:

Each assessment having 50 points max, with Actual Points as grading scale.

Let's move to gradebook to see how the overall calculation works

Now, lets capture scores to the assessments students has completed.
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Note: There are 2 categories( i.e, Class Test and Final Exam)  the first category(Class Test) is having 3 assessment(i.e, Test 1, Test 2,Test 3) and the second category(i.e, Final Exam) is having one assessment(i.e, A-1 Exam).

Formulas:

As per the attached snapshot, 

Category-1: Class Test - has below assessments

Test-1 = (Obtained/Total)*Weight
          = (30/50)*50
          = 30
Test-2 = (35/50)*50 = 35
Test-3 = (45/50)*50 = 45

Category-1 score = (30+35+45) / 3 = 36.66
Class Test = (Test 1+Test 2+Test 3)/ total number of assessments

Category-2: Final Exam - has below assessment

A-1 Exam = (Obtained/Total) * Weight
                = (40/50) * 50
                = 40

There is another criteria to be considered here, which is Weight Percentage.

Weight Percentage is considered when you enable the option Consider overall score calculation for categories without grade entry?
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Now the system considers the overall if there is no grades to other assessment categories, that are Extra Credits, Internals, Laboratory.

Our system considers the overall score of any given subject is 100 percent, if the weight total is not 100 then the system considers the Weight-Percent the column in while setting up weight (%)
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In the above screenshot the total is 80, but system needs to make sure it wants to setup the overall to 100, hence system considers the weight-percentage to calculate the overall.

Weight Percentage = (Weight/ Total Point) *100
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Extra Credits - 0
Class Test - 32
Final Exam - 48
Internal - 0
Laboratory - 0
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Weight Total Point = (0+32+48+0+0) = 80 

Now, lets take an example of the Spanish Subject:

​Consider this subject has assessments with total points 100, grading scale Actual Points.
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Category-1: Class Test - has below sub assessments

Test-1 = (Obtained/Total)*Weight   = (65/100)*32  = 20.8
Test-2 = (78/100)*32 = 24.96
Test-3 = (49/100)*32 = 15.68
Class Test = (20.8 + 29.46 + 15.68) / 3 = 20.48

Category Score = (avg-score/weight)*weight percent = (20.48/32)*40 = 25.6
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Category-2: Final Exam - has below sub assessment

A-1 Exam = (Obtained/Total) * Weight = (82/100) * 48   = 39.36
​ Considering Weight Percent = (39.36/48) * weight percent = 0.82*60 = 49.2

Therefore the overall = Category 1 + Category 2
                                    = 25.6+49.2
                                    = 74.8 out of 100

This is how the overall is calculated