QRMP scheme

Mam, Under QRMP scheme for Jan- March quarter, we should file GSTR-1 & GSTR-3B in March month only??

2) Payment of tax should be made every month under self -assessment method after adjusting ITC. Am i right ??

3) Invoices should be uploaded every month under QRMP. Am i right ?? 

4) Invoices should be uploaded every month just like GSTR-1 but GSTR-1 should be filed in March month only, wherein remaining invoices (i.e. Invoices pertaining to March month) should be filed . Am i right ??

5) Invoices should be uploaded every month ON OR BEFORE 13TH under QRMP. Am i right ?? 

Thanks..