How can I group student scores into quintile using SQL Server 2008

Can anyone help me to group student scores into quintile. I think there is a feature in SQL Server 2012, but still we are have not upgrade to it as we are using 2008R2. I tried Ntile(5) but it not generating the desired result. I need below Quintile column
Student Score Quintile
Student1 20 1
Student2 20 1
Student3 30 2
Student4 30 2
Student5 40 2
Student6 40 2
Student7 50 3
Student8 50 3
Student9 60 3
Student10 70 4
Student11 70 4
Student12 80 4
Student13 80 4
Student14 90 5

Please try to get ranking for below data
HI , I need a dynamic SQL which would handle few hundred records and scores may vary..Sometime it may be small test marks ranging from 5 to 25 sometimes it may be out of 100.
I tried for larger data set. It
failed. It is not at all showing Rank 3.Since it not falling in the comparison Below are the 99 records.
Student
Name -> Score
Student
1 to 5 -> 4
Student
7 to 26 -> 5
Student
27 to 71 -> 6
Student
72 to 98 -> 7
Student
99 -> 9

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