Kroy Biermann aced a good parenting test in the midst of his nasty divorce with Kim Zolciak ... and turns out he completed the course before she finished a similar one.
The former NFL star completed a mandatory course in Georgia -- "Parent Education For Separating/Divorcing Families" -- last month and he scored 99% on the quizzes and final exam.
Kroy filed a certificate of completion with the court, obtained by TMZ, and he got his work done before his estranged wife did.
As we reported ... Kim completed a seminar on "Navigating Family Change" on May 25 ... but Kroy's certificate shows he finished his online course May 17, a full week before Kim. BTW ... the course is mandatory for couples with kids seeking a divorce.
Remember, Kroy is asking for sole custody of the estranged couple's four kids ... Kim's asking for primary physical custody, so this is a full-on dogfight.
The course focuses on helping parents make divorce easier on children ... and it sounds like they need to apply the skills they learned.
The divorce has been exceedingly nasty ... with Kroy ripping Kim for what he says is a gambling addiction, while she claimed he's a pothead who needs to take a drug test.
Kim, Kroy and their kids are all still living under the same roof as the divorce chugs along ... putting the kids right in the middle of everything.