The point of testifying under oath. Is to A. make sure they feel strongly enough to go on the record and risk perjury. If they can honestly say I don't recall that event then that is what they say. B. You want to assess their creditability as a witness. Do they seem nervous? Is there a particular line of questioning they seem reluctant to answer? Do their answers sound credible? C. Even if they honestly don't recall the event in question, they can provide testimony as to how likely it was the event occurred.
Some of the questions to Juge or Kavanaugh could be along the lines of.
Did you drink a lot in high school?
How often did you drink?
What was the 100 keg quest referenced in your high school yearbook?
Did you participate in that event?
Did you go to a lot of parties in high school?
Where you ever "blackout" drunk?
How often were you "blackout drunk?"
How would you define "blackout drunk?"
Have you ever passed out from drinking too much?
What is the Devil's Triangle and did you ever participate in one? Why was it mentioned in your high school yearbook?
What is the significance of the capital F's in this phrase FFFFFFFourth of July?. What do they stand for?
How many women have accused you of sexual misconduct in public and/or in private?
What type of sexual misconduct did they accuse you of?
Did you know Ms. Ford during High School?
Were you ever alone with her?
Did you see her at any of the parties you attended?
Were you drinking at the time?
Is it possible you don't remember seeing her because you were "blackout drunk?"
How can you be sure you didn't attend a party she was at when at least one time you admit you were blackout drunk?
When did you first learn of the allegations made by Ms. Ford?
Were you aware of these allegations in High School?
Why did you tell a high school friend not to believe anything Ms. Ford said?
While attending parties did you ever see any female sexually abused?
Who did it?
What did you do?
Did you report it?
Were any females provided drugs and/or alcohol at these parties?
...And so on. Do a variation of those for the college days.
Back in the day, my favourite was when you knew they were lying about something. Ask them variations of the same question over and over again to get them on the record as lying in front of the Judge. Then after you have asked them as many times as the judge lets you get away with, pull out the proof they were lying. A lot of times the proof isn't even dramatic. Witnesses are segregated so they can't listen to other Witnesses testify. Ask the other witnesses the same questions beforehand and place them at the event in question. Then when the guy or gal comes out that you want to nail, they look foolish in front of the Judge or Jury when their version of events is different than everyone else.
Update Oh, my, one of Kavanaugh's female supporters discovered that she was the butt of Kavanaugh's and his friend's jokes when his yearbook got released to the press. She was mentioned 14 times in the yearbook and referenced to in a way that was similar to the old town bicycle joke. She is no longer saying nice things about Bart.