1.) If I file for divorce in USA with mutual consent, it will be valid in India ? EVEN IT IS BEFORE ONE YEAR. My lawyer told me you can get divorce with mutual consent. But I am not sure it will be valid in India or not. Or i should wait till one year to complete and start process ?
As per Indian law i.e., Hindu Marriage Act, a divorce petition cannot be filed before the court within one year from the date of marriage without the permission of court by another provision. The mutual consent divorce decree obtained in US is valid but it is a question that whether the US courts accept the divorce petition within one year from the date of marriage
2.) We both can marry legally in India and get a marriage certificate, without getting an Indian divorce decree?
The mutual consent divorce decree granted by US court is very much valid in India hence there is no problem in getting married again in India and getting a marriage certificate to that effect.
3.) We both Can produce my US divorce decree at a Marriage Registrar Office to claim a second marriage certificate?
The above answer will be applicable for this too.
4.) If I get divorce from USA with mutual consent, in future she can do anything against me or not.
What she can do? what do you expect her to against you?, The mutual consent decree granted by US will be a valid divorce hence if at all she files any application to reject it, it cannot be held valid in India.
5.) If i do court marriage in USA after divorce then still i need divorce decree from Indian court ?
Not necessary.