| Choose Exam Category |
| Activity | Precedence | Duration (in days) |
| P | - | 3 |
| Q | - | 4 |
| R | P | 5 |
| S | Q | 5 |
| T | R, S | 7 |
| U | R, S | 5 |
| V | T | 2 |
| W | U | 10 |
Critical path suppose to be the shortest path for any activity .