How can I collate PDF pages together.?
You need a full version of Adobe Acrobat or Acrobat Professional. Open the PDF file you want to add the pages in. Once that PDF is open go to DOCUMENT –> INSERT PAGES and a “Select File to Insert” dialogue window will appear. Browse to the PDF file you want to add-in and choose the “Select” button. A “Insert” dialogue window will appear next with options as to where in the current PDF to insert the selected PDF. Choose “OK” to insert. Repeat as many times as needed and be sure to save your updated PDF. TIP: If you insert the page(s) to the wrong location of the PDF, you can either close without saving and try again or enable the “thumbnail” view along the right side of Acrobat and drag-n-drop the page(s) to the correct location.