You have some syntax problems with your option:
<OPTION value=1><c:if test="${requestScope.numberoffmonth=='1'}">selected</c:if>>1</OPTION>
After the "value" attribute, you have an extra
>
try this instead:
<OPTION value="1" <c:if test="${requestScope.numberoffmonth=='1'}">selected</c:if>>1</OPTION>
if you are using JSP 2.0 (servlet 2.4) you could make it a little cleaner like this:
<OPTION value="1" ${requestScope.numberoffmonth == '1' ? 'selected' : ''}>1</OPTION>