Noura H said:
The end of the Arabic section is the begnning of the english, and the end of english section is the beginning of the Arabic.
The main problem in what you ask for is that the Arabic section uses right-to-left layout, and the English section uses left-to-right layout, resulting in two separate numbering flows starting from the opposite sides and growing towards the middle of the book, and not two separate flows where one follows the other.
I've done several similar projects, and the best way to achieve this is by using the ME version of InDesign to create two separate documents. One with RTL layout for the Arabic, and the other with LTR layout for the English (and if the layout of each language demands more than one file, do it in two separate Books).
You can also use the Reverse Layout feature of the ME version to reverse the layout of one of them in order to create the other, then replace the content.
The only other thing you need to remember is that when loaded into the imposition skeleton, the LTR layout should be loaded in reverse pages order.