My 10th=80% 12th =60% b.com=67% then what % is required in cat to get call from iim or fms if I am from general category

A general rule of thumb is 90-90-90 and then 95+ in Cat.
But your 12th and graduation percentages are nowhere near to 90s. Or even 80s to have an argument. It will be really difficult for you to get IIM calls and also to convert them below 97 percentile. Top 10 IIMs won't call you unless you have a stellar research or workex background or extreme strong extracurriculars base with your profile mentioned.
You can still get calls with 95-99 percentile range from new IIMs. And for converting them you will require very good Wat-Pi scores. So gear up for the same and work hard to get a very good percentile.
And since you're from a non engineering background you can easily leverage that in an interview by showing ur skills and how you can provide diversity and peer learning at an institute.
For FMS 99.99 nothing lower than that.
Hope this helps!!
All the best.
SMIT-IIM-AMRITSAR-PGP/04