Get special record position in records

It's impossible that the query gives this result, unless you add "DESC" to the ORDER BY clause.

Convert the result to an array. Then do an array_search for "Sara". It will give you the array key. Because arrays are zero-based, add 1 to the key to determine Sara's position.

Hey do you can help about below result?
I need define level for each user with his score
Example if user's score is 25 so level is 6
Thanks
Level 1: 0
Level 2: 5
Level 3: 10
Level 4: 15
Level 5: 20
Level 6: 25
Level 7: 30
Level 8: 35
Level 9: 40
Level 10: 45