Rearrange or replace only the second line after pattern match or pattern match

Shell Programming and Scripting
1

Im using the command below , but thats not the output that i want. it only prints the odd and even numbers.

awk '{if(NR%2){print $0 > "1"}else{print $0 > "2"}}'

Im hoping for something like this

file1:
Text hi this is just a test
text1 text2 text3 text4 text5 text6

Text hi another text
data1 data2 data3 data4 data5 data6

Output:
Text hi this is just a test
text5 text4 text1 text2 text3 TEXT6_willbe replaced_by_BOOK

Text hi another text
data5 data4 data1 data2 data3 DATA6_willbe replaced_by_BOOK
2

Can you post a sample of the actual input...

3

THe line two, after Line1(Text .. . .) has been re arranged. Column six has been replaced.

Output:
Text hi this is just a test
text5 text4 text1 text2 text3 TEXT6_willbe replaced_by_BOOK

Text hi another text
data5 data4 data1 data2 data3 DATA6_willbe replaced_by_BOOK