u/Catsarechill

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Hello! I am a college student whose been learning German for 3 years. I just finished my school's 'Advanced German's course but I am horrific at grammer. What I've been reading from other posts here are that I should get books like GrammatikActiv. I will get that book but I was wondering if anyone had tips for cementing grammer in your head. I can practice in a workbook but what's the best way to really remember to use it when writing and speaking?