How to merge PDF files

We usually prefer to receive all your application data in one single PDF file.

If you're using LaTeX to prepare your application, you can easily add PDF files with the pdfpages package:

\documentclass{...}
\usepackage{pdfpages}
...
\begin{document}
...
\includepdf{pages=-}{filename.pdf}
...
\end{document}

If you don't use LaTeX but have a set of PDF files, you can use one of the many free programs to merge PDF files, e.g. PDF Toolkit or PDF Sam.