There really are no "great" or "legit" online Hungarian courses. There is a reason why: Hungarian is very difficult to format properly online.
First and foremost, you should read (or get the audiobook version) of "Fluent Forever", such as via Amazon/Audible, which will tell you what materials are best for self-learning. It's even better: the author has taught himself Hungarian too!
It is in your best interest to find tips from Polyglots and to be self-disciplined. Also, you just need to get really into it, as much as possible.
This website has a bunch of Hungarian language sources (see post 2). The previous link is also a wonderful source for language learning, in general, so you should search around there. Apps (such as Mango Languages or Duolingo or LingQ or Memrise) are really only worthwhile for learning vocabulary. You should also go to TED.com to find dubbed Hungarian audio to popular talks, with Hungarian subtitles (which are synchronized) to help you study.
Glossika.com helps tremendously in becoming conversational, even though it is boring....) I also use WidgitOnline.com to make "picture flashcards" (note: you do not need the "language learning pack" although it is nice), to get me to that level. I transfer the pictures (only) to a program called Anki and format my "flashcards" further in that app/program.
You should consider getting a tutor that specializes with working with native language speakers via Skype, that you meet with 1-2x/week. Even if they are the best possible tutor, with the best possible credentials and reviews, I doubt that it will cost more than USD $25/hour.
After about 50 hours of work, you should be semi-conversational. From there, I would go on iTalki.com, and book the cheapest Hungarian speaker you can find. Do "virtual language immersion sessions" without speaking a single word of English during the session. That is the key to learning languages effectively and quickly.
Although this is not related to "language learning", this post on an engineering board is highly informative for self-studying and for finding materials that will prepare you for a "standardized exam" and is applicable to language learning. You should read this entire post even if you do not feel that it is pertinent to you. This particular forum (for pre-med students) may give you ideas for structuring your self-learning plan, too. This particular book will help you prepare for a "language test", too.
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