An acceptable conclusion will summarize the information presented in the body paragraphs of the essay.
A strong conclusion, however, might not present new evidence or new proposals, but should present something new. This might mean:
- providing new insight on the ideas presented in the above paragraphs
- reflecting on the significance of the problem at hand
- analyzing the relationships between the ideas presented
- describing the implications, consequences, remaining questions, unresolved issues, or future directions that would follow your proposed solutions
- formulating a decisive opinion on the solutions you've proposed
For more PCAT writing tips, I recommend checking out Chapter 2 of the PCAT Review Book and getting practice with the Writing section of Full-Length PCAT Exams.