how to print 2sides scanned file

1. the 2sides report was scanned as two files - 1. pdf (face from small -> big page number) and 2.pdf (back from big-->small page number);
2. print the 1.pdf at the big printer (any printer) using reverse order 11, 9 , 7, 5, 3, 1;
3. put the printout at the small printer (words to up and head to outside);
4. print the 2.pdf at the small printer.