Hi My 10th perrcentage is 89.3,12th is 79.45 and grad is 60.2(bsc) is this good enough for tire1 collages?

Hi Meghna, If you're targeting the top IIMs, the required CAT percentile will also depend on your category. If you're aiming for other Non-IIM b-schools, your chances majorly depend on your entrance test score and less on past acads. So, focus on maximising you're score in the entrance tests.
You can also check the required CAT percentile for tier-1 colleges here: https://cracku.in/cat-percentile-required-for-iim-calls