How do I … i have received notice for short payment of tax, but there computation is wrong, what do i do ?

in my return i had taken x amount of short term capital gain, which they have seemingly taken up at full rate tax, thus giving short tax notice
When i have checked i found that i have undercalculated my regular income tax by 10k and for short term capital, taken wrong amount and thus paid excess tax, net net i need to pay only 5k plus interest extra, what procedure do i use to sort this?

Tax payment after resigning from a company and going for higher studies?

Hi I am an Indian resident. I was an employee of an IT firm in India for the past 3.5 years until i resigned shortly 2 weeks back as i would be going for higher studies a couple of months later. Mean time i would be preparing myself for the study and not to be engaged in earning. So i need to know do i need to pay the tax after i resigned from the company and the fact i am no more a salaried person. If yes what’s the structure like?