United Kingdom, Dec. 18 -- Kim Kardashian had a "mental breakdown" days before her bar exam.

The 45-year-old reality star - who spent six years preparing to become a lawyer before taking the test over the summer - admitted last month she had failed the exam, and she has revealed how much she was struggling in the build up to the assessment.

In the latest episode of The Kardashians - which including footage filming just nine days before the test - she said: "I'm absolutely gonna cry, cause it's f****** exhausting."

Kim admitted she had "hit a wall" with her preparation for the test.

She added: "I threw my back out, and it's like, every time I think I get to another step, something pulls me back.

"There's all these f****** roadblocks, ...