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It really depends on how you study best and what you can afford. Online gives you more flexibility and costs way less, but you need real discipline - if you don't have someone pushing you, you risk putting things off or skipping lessons. A private course keeps you on schedule, you have a teacher who sees where you're making mistakes and you can ask questions on the spot, but it's pretty expensive and maybe the times don't work with your other commitments.
In my opinion, the best choice is often a mix: you can use online platforms for the theory (they're cheap and you can review whenever you want), but then get a private tutor just for practice tests in the last few months, when you really need personalized feedback. That way you don't spend a fortune but you're not tackling the test completely on your own.
Before you decide, ask yourself: can I study on my own without procrastinating? Do I have the money for a full course or could I just do a few lessons? And how many months do I have ahead? If it's only a few months and the test is really competitive at your university, maybe private tutoring is worth it.
Online works only if you do actual practice tests, not just passive videos - that's the difference that really matters, more than the format itself. Whoever says you need discipline is right, but a private course isn't a magic solution if the course is trash; better to pick a solid platform with real feedback on your tests, even if it costs less, than to pay a lot for generic in-person lessons. Budget matters, sure, but don't let that be your only guide - check if whoever's offering the course (online or not) gives you access to old exams and whether anyone they've worked with actually passed.
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