There are four parts to test the four skills, reading, writing, listening and speaking. Each part is equal and is 25 percent of the total score. The final result is an average of all four parts.
If you receive a low score for one part of the exam that you find difficult, you can still pass the exam if you are stronger in the other parts. There are no penalties if you do badly in one part of the exam.
Calculating the pass rate and grades for the exam is a complex process. If you do practice listening and reading tests, you can consider 60% as a pass.