Hi,
No, tabs (add-on recordsets) are always displayed after additional pages of the main recordset.
In your example:
|TEST||TEST2|Contacts|Notes|
where Test and Test2 are additional pages of the main record, Test and Test2 will be displayed first, then Add-ons.
You can control the priority of Add-Ons via RecordBrowser in admin - Record Browser - Manage Addons:

So that you can choose Contacts then Notes or Notes than Contacts.