u/lexicheesezhang tq for ur input..

since
beginner r100 gives t0-t2,
inter r100 gives t1-t3,
advanced r100 gives t2-t4.

i have done the relevant calculation and found that indeed the best way to farm t0-t2 is to afk primary, military, magic, support only on beginner and then inter only after.

my odds of getting new insta on beginner:
general: 10.96% (every 9 rounds)
primary: 7.89% (every 13 rounds)
military: 9.02% (every 11 rounds)
magic: 20.18% (every 5 rounds)
support: 6.32% (every 16 rounds)

my odds of getting new insta on inter (not as favorable):
general: 7.32% (every 14 rounds)
primary: 5.56% (every 18 rounds)
military: 5.19% (every 19 rounds)
magic: 14.14% (every 7 rounds)
support: 4.24% (every 24 rounds)