In my short 5 year career as a math teacher, this upcoming year will be the 1st time where I get back some students from last year. Here are the specifics. 7th grade will be a new group. 8th grade was last year's 7th grade. (I had them.) 9th grade Alg IA will be last year's lower level 8th grade. (I had them.) 10th grade Geom will come from last year's upper level 9th grade Alg I. (From other teacher) 11th grade Geom will come from last year's lower level 10th grade Alg IB. (From other teacher) 12th grade will come from last year's 11th grade Geom. (I had them.) Who has had experience with teaching the same students over multiple years and are there advantages/disadvantages to this?