As a private doctor, the income earned by you will be treated as consultant/professional income and you would have to file ITR 4Sugam at the time of ITR filing.
Amount gifted by your mother will not be taxable.
It is better to maintain a current aaccount for your clinic transactions as end of the year, bills and transactions have to be maintained in order to claim deductions for expenses incurred by you for running your clinic.
Dividends on mutual funds are tax-free.