Try the code below.
select
bvagnt,
[Level 1] as [A%A],
[Level 2] as [A%G],
[Level 3] as [A%M]
from
(
select left(bvagnt, LEN(bvagnt) - 1) as bvagnt, bvname
from tablez
) as src
pivot(
max(bvname)
for bvname in ([Level 1], [Level 2], [Level 3])
) as piv