I went to Avtech at riverside 2 years ago, passed with no problems. But then I already have almost 15 years experience as an EASA B1.1 & B1.2, that helped a lot in terms of written exam and oral & practical exam.
It's located about 2 hrs from LAX. I took shared van, that's why it took 2 hrs, otherwise if you take taxi that will be maybe 1 to 1 1/2 hrs, but cost much more $$$.
Since you have experience, I suggest you take the "home study course" package offered by Avtech. They will send you 3 books which is all the questions you need to memorize.
With the "home study course" package, you only go to Avtech for the oral & practical preparation & then you go there for about 5 working days & they will prepare you for the oral & practical, provided you have passed the written portion.
Only down side is, your oral & practical will NOT be conducted at Avtech Riverside, but can be anywhere from Long Beach or somewhere within an hours journey. Arrangement for the oral & practical will be done by Avtech & subject to availability of the examiner. I spent Monday to Friday at Avtech preparing for the o&p, then Saturday full day was my o&p exam.
If you want more info pls PM me.