Loop Through Index Worksheets Using For Loop And Select Clause

I have a workbook that contains, say, 50 worksheets: the first two worksheets summarise the data and are static in that they don't move position. However, the next four worksheets contain certain data for any given month. Each time a new month comes along, say, November, I insert four new worksheets after the two static ones as a result October's four worksheets are simply moved down the line in terms of worksheet order.

I need a macro to refer to the first six worksheets only (not the other tabs). I opted for index referencing for each worksheet, ie one - six. Now within these six worksheets in any given month, I need to sort the data by a certain column. The problem: in sheets 1,4,5 and 6 I need to rank by column E, but in sheets 2 and 3 I need to rank by column C. I have stepped through the code, which works for sheets 3-6, but doesn't seem to refer to sheets 1-2.

Sub WorksheetLoop()
'
' Loop through an indexed number of worksheets; _
' & this ensures that the worksheet range is dynamic _
' and is able to adjust when new sheets are added/removed, etc.
'
'Dim ws As Worksheet
Dim i As Long
Dim ws As Worksheet

[code]....