here's my two cents
i loooooooooove anki, there is a learning curve but you really don't need to learn much to get started and start benefitting straight away
as for the alternatives like memrise, yes they are more padded and the user interface is nicer to look at but anki is just so much more customisable and there are countless add-ons to make your experiences better
actually, i used to use memrise from about midway through y7 to midway y8 for language learning, but then wizjaro introduced me to anki and that literally changed my life ... according to the analytics page it says i've reviewed well over 200k cards by this point, and it's saved me countless times whether it be for commerce, languages or even english. memrise/quizlet is by no means bad, but anki is just much more efficient and powerful
imo the only drawback is that using anki requires motivation which can be a scarce commodity at times, and its easy to lose focus and let the reviews pile up and then spiral into a SRS debt just like in real life, but if you can muster up the courage to review each day, then the benefits are realllllllly fruity
i think if you're already thinking of trying anki, even at this time in y12, it's never too late to learn!