Whatever prep provider you use, the most important thing is your practice?

Sorry I feel like ive already asked this but I got advice from my brother yesterday who passed all Levels in the first attempt, So i was asking him if i should just use the CFAI or go with kaplan (because kaplan will provide local in person classes) which will force me to study on workdays.

He told me whatever you use, the important part is just to practice as many mocks as you can. That I could do kaplan but just have enough time to practice. Now, he took L3 like 3 years ago So i want the opinion of the recent passers… I dont feel like i do well with self studying but at the same time I wanna ensure that I am covered with all topics since kaplan tends to be somehow of a summary of CFAI.

If I would do the CFAI i’d for sure sign up with Marc for the videos but like I said I think what helped me in L2 was going to class and being forced to study on weekdays given my demanding job.

Opinions?