Answer: To be able to receive the Federal Student Aid, you have to enter your Social Security Number. By doing this the Government can cross the data to certify you are eligible to this Federal Aid.
Alliteration is when two or more words have the same beginning sound. In the poem there are three examples:
1) Though...thy...thou
2) crest...craven
3) shorn...shaven
Alliteration gives the text a more unified rhythm, in a way I guess. It makes the piece sound more together.
Hope this helps!