Typically, exit criteria may consist of various metrics that indicate whether testing has been sufficiently thorough. Estimates of defect density or reliability measures are common exit criteria used to decide if the software is ready for the next stage or release. These criteria help in assessing the quality and stability of the software based on the number and severity of defects found during testing.

Equivalence partitioning is a testing technique that divides input data into partitions of equivalent data from which test cases can be derived. The goal is to ensure that at least one value from each partition is tested. The partitions for the examination marks are:
* Fail: 0-39
* Pass: 40-59
* Merit: 60-79
* Distinction: 80-100
In set B (0, 45, 79, 87), each value belongs to a different equivalence partition:
* 0 (Fail)
* 45 (Pass)
* 79 (Merit)
* 87 (Distinction)
Reference: ISTQB CTFL Syllabus V4.0, Section 4.2.1.

Complete statement and branch coverage means that you have tested every statement and every branch in the program. Statement coverage ensures that every executable statement in the code is executed at least once, while branch coverage ensures that every possible path (true and false conditions) through the program's branches (such as IF statements) is executed. Achieving both covers a significant portion of the code, providing a thorough validation of its logic. Reference: ISTQB CTFL Syllabus V4.0, Section 4.3.2.

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