Career Advice About interviewing.io

I have a new grad final with Meta and I had a mock interview on . I did pretty badly on the interview as it took too long for me to arrive at the solution and write down the code. The interviewer suggested that I try purchasing a dedicated coaching package for 5 lessons, which is perfect since my Meta interview is in 3 weeks (I take 2 lessons/week). Issue is that it's quite a heavy price tag at around 2.8K. I'm wondering if anyone else has used the service?