try this.
<asp:Repeater ID="rep1" runat="server">
<HeaderTemplate>
</HeaderTemplate>
<ItemTemplate>
<table width="100%" border="1">
<tr valign="top">
<td valign="top" width="5%">
[Category]//Bind data from database
</td>
</tr>
<tr>
<td valign="top" width="95%">
<asp:Repeater ID="innerRep" runat="server" OnItemDataBound="Inner_rep_ItemDataBound">
<ItemTemplate>
<table width="100%">
<tr>
<td width="9%">
[ Questions] //Bind data from database
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
Code Behind coding try out by yourself i have just given u an idea.