Here is how to calculate the aggregate pointers (CGPA) for all 8 semesters:

1. Calculate the SGPA (Semester Grade Point Average) for each of the 8 semesters by:

- Multiplying the credit points for each subject with the grade obtained

- Adding up the products for all subjects in that semester

- Dividing the total by the sum of credits for that semester

2. Add up the SGPA values for all 8 semesters

3. Divide the total SGPA by 8 to get the CGPA (Cumulative Grade Point Average)

For example, if your SGPAs for the 8 semesters were:

7.8, 8.2, 7.5, 8.0, 7.9, 8.1, 7.7, 8.3

Then the calculation would be:

(7.8 + 8.2 + 7.5 + 8.0 + 7.9 + 8.1 + 7.7 + 8.3) / 8 = 63.5 / 8 = 7.94 CGPA

So with the given semester-wise SGPAs, the aggregate CGPA across all 8 semesters is 7.94.

The key steps are:

1) Calculate SGPA per semester

2) Sum the 8 SGPAs

3) Divide total SGPA by 8

This gives you the final CGPA that represents your overall academic performance across the 4 years of your engineering degree.