pdfpages typically inserts page breaks before inserting content, causing problems if you want to have an arrangement if pages inside a figure environment. Instead, use the page key-value of \includegraphics itself to insert the contents on a page-by-page basis. Something like this:
\begin{figure}[ht]
\centering
\includegraphics[page=1,width=.3\textwidth]{test}\hspace*{.25\textwidth}%
\includegraphics[page=3,width=.3\textwidth]{test}
\includegraphics[page=2,width=.3\textwidth]{test}
\caption{Test}
\label{fig:Test}
\end{figure}
If you want the last "image" (page=2) to be shown in a nup=2x2 fashion, you could add \hspace*{.55\textwidth} after it, otherwise it will be horizontally centred below the two "images" (page=1 and page=3) above it.
Of course, you can play with the width adjustment to suit your liking.
\includegraphicson an image-by-image (or page-by-page) way. Also,\labelshould be after\captionalways. – Werner May 29 '12 at 12:16\includegraphicsselect a particular page from apdf-file? I also tried to to something like\includgraphics{\includepdf{...}}. – student May 29 '12 at 12:18\includegraphics[page=1]{file}, for example. – Werner May 29 '12 at 12:18