You will be assessed continuously via assignments, coursework, presentations, tests and even extra- and co-curricular activities. Depending on the course & institution, all this can contribute to approximately 70% of your overall assessment, with the remaining 30% via final exams.
Final grades for each subject will be a single score, called the GPA (grade point average) on a 0.0 to 4.0 scale. The top grade is an A, which equals 4.0. This is the standard scale at most colleges and universities.
The final result is called the CGPA (cumulative grade point average) which is also on a 0.0 to 4.0 scale. It is derived from the GPA obtained from all your individual subjects.