Inserting pages from one PDF into another PDF

Let me know if you find any best solution.

Read this:

https://community.adobe.com/t5/acrobat/combining-an-even-pages-file-and-an-odd-pages-file-into-one-pdf-achieving-propper-order/m-p/1119765?page=2 

So you mean interleave the two files? Yes, it's possible, but it's tricky. For starters, after you insert the first page after page 1, page 2 of the target file is no longer page 2, but page 3... So you'll have to either keep track of that when deciding where to insert each page, or do it in reverse (starting from the last page and moving backwards to the first).

I've actually created a (paid-for) tool that allows you to do it very easily and quickly. You can find it here: http://try67.blogspot.com/2008/12/acrobat-combine-even-odd-pages.html