[funnyflamigo]

It's heavily domain dependent IMO.

Leetcode only gets you pass the first round of interviews and not every company does them. I consider these useless textbook problems but you'll need them to get the job. They won't help you much in the job.

More importantly (imo) he needs domain specific knowledge. I.e. if it's going to be web development then he needs to start a web project with the backend in python. If it's stats/analysis he needs to start on analysis projects. Etc.

My advice is on making small projects that cover topics he'll be working on in the jobs he applies for to build a small portfolio. And brush up on the leetcode like a month before.