Crash course for interview loops?

I have a couple of recruiter screens mid-week next week. Non-faang if that matters. I'm assuming it will just be a recruiter call and then will get a tech screen later if that goes well. I'm a junior engineer (>1 year exp), It's been a while for me doing leetcode and I never got very far with my DS&A courses. In the past I got decent at easy and barely medium leetcodes, but then just focused on getting better at my job/internships.

So my question is, if I have a tech screen next week or the following, is there a crash course that can get me halfway there? Any tips for a rigorous study schedule that anyone's followed when they have a week or a week and a half max? I have the time during the day.

I would treat these as practice interviews since I'm just starting to look, but one of them is actually an ideal job that was kind of a reach... so I'd like to maximize my chance.