ways to give my animals equal amounts of me time

so i am an animal lover as i have 1 cat a rabbit two rats and 7 hamsters but how do u reckon i should ration my time because i’m still in high school and have exams to study for so i’m juggling revision and my babies i give them as much of my attention as i can but they always want more but i have to give them all five mins each. i feel really bad when i only give them a bit of attention at the min. what should i do. they love me to bits and i do them but i have like 3 exams coming up and have to revise. any help would be appriciated. i get home from school at around 3:45pm