NO Blank Fileds.
Visa office Name should be correct like New Delhi, India. If you give country name you may get rejection
Ensure Payment method, You CC should have atleast six months validity
Consistent Information
Detailed job duties
1) clearly mention N/A or use specific words as given in the instruction guide especially for sections that ask for citizenship of other countries/membership of any group.
2) For all current activities/experience/job/address don't write the end-date. Instead write 'Current' in hand.
3) Dont' forget to calculate appropriate proof of funds as required for your family size and mention the amount correctly.
4) Attach original IELTS and PCC with your application.