Here are The Post’s college football rankings following Week 6:

1. Ohio State (5-0) (Last week: 3)

It’s go-time for the Buckeyes: They face their first real test on the road Saturday against undefeated Oregon.

2. Texas (5-0) (2)

First is Oklahoma on Saturday, then Georgia a week later. We’ll know how good Texas is by how it performs against the toughest opponents it will face during the regular season.

3. Oregon (5-0) (6)

The Ducks are undefeated, are at home and a four-point underdog against Ohio State. The experts don’t trust Oregon.

4. Georgia (4-1) (4)

Georgia responded to the heartbreaking loss to Alabama with a workmanlike victory over Auburn. Another easy game is next, Mississippi State at home, before the Bulldogs have to deal with the gauntlet of Texas, Ole Miss and Tennessee in the span of a month.

5. Penn State (5-0) (7)

Take away the shoddy Bowling Green performance and Penn State is allowing 7.5 points and 197.7 yards per game. That is championship-level defense.

6. Alabama (4-1) (1)

For just the second time since 2007, Alabama lost to an unranked opponent. Vanderbilt, a 22.5-point underdog, had never beaten the No. 1 team in the country in program history until Saturday. Crimson Tide coach Kalen DeBoer went from hero to goat in a hurry in Tuscaloosa.

7. Tennessee (4-1) (5)

Alabama’s loss to Vanderbilt overshadowed Tennessee’s shoddy effort in a loss at Arkansas, the Razorbacks’ first top-five win since knocking off the Volunteers in 1999. Nico Iamaleava has looked like a freshman lately, failing to throw for more than 194 yards in his last three games.

8. Ole Miss (5-1) (8)

A quality response by the Rebels, manhandling South Carolina on the road after the loss to Kentucky. Most impressive: The defense held the Gamecocks to three points and forced a pair of turnovers.

9. Miami (6-0) (9)

Miami is the lone undefeated team left in the ACC, and Saturday’s visit to Louisville doesn’t look nearly as daunting now that the Cardinals have dropped consecutive games to Notre Dame and SMU. The Hurricanes have no excuse not to win double-digits for the first time since 2017.

10. Clemson (4-1) (NR)

Since that ugly season-opening loss to Georgia, Clemson has outscored the opposition, 125-28. Quarterback Cade Klubnik has keyed this four-game winning streak, throwing for 14 touchdowns and one interception in that span.

Dropped out: Missouri (4-1)

Heisman Watch (in alphabetical order)

QB Dillon Gabriel, Oregon

We’re waiting for the super-senior to use his legs more. Maybe he’s been saving it for Ohio State.

WR/CB Travis Hunter, Colorado

College football’s Ironman never comes off the field. He’s a two-way dynamo, with 46 catches for 561 yards and six touchdowns on offense, and 15 tackles, two interceptions and a forced fumble on defense.

RB Ashton Jeanty, Boise State

At this point, why can’t Jeanty win the Heisman? He’s crushing opposing defenses. The latest victim was Utah State, which was gashed by the junior for 186 yards and three touchdowns on 13 carries.

QB Jalen Milroe, Alabama

Milroe’s numbers — 310 yards passing and a touchdown — were solid, but his overall performance was not. His pick-six gave Vanderbilt belief, and while Milroe rebounded from there, he didn’t do nearly enough in the stunning upset.

QB Cam Ward, Miami

Interceptions are becoming a problem for Ward, with four in his last three games. Still, he was able to avoid disaster Saturday night, throwing for 437 yards and producing three scores in a dramatic, come-from-behind win at Cal to keep Miami undefeated.