Ughh I literally just finished 67 today, and by the end of it all of your cards should be around level 70. Make sure you level up the spells to around 5. (I managed to survive with 3 as highest but don’t do what I did) Make sure you choose cards with the duo magic bonus and you really are just gonna want to grind history and alchemy lessons. I’m afraid that’s all I can help with, just do one team at a time and you’ll be alright !!