Getting an 87+/100 average on my CS degree

I'm 18 currently and my BSc in computer science is coming to an end. I recently got 2 failed tests on two different courses and another 64 on Linear Algebra 2 which gave me a shock so I now have this urge to better my grades.

I will be updating my progress here:
Infinitesimal mathematics 1:
Infinitesimal mathematics 2:
Linear Algebra 1: 64
Linear Algebra 2: 64
District mathematics: 86
Introduction to mathematics: 84
Introduction to programming (in Java): 79
System programing (in C): 88
Coding theory:
Data base systems:
Operating systems:
Data structures and an Introduction to Algorithms:
Algorithms:
Probabilities and statistics:
Computational models:
Principles of information systems development:
Communication networks systems:
Defensive systems programming:
Introduction to Machine Learning:
Logics:
Computer organization:
Numerical analysis 1:
Programming languages:
Computer graphics:
Seminar:
Workshop:

(edited 3 months ago)