Proper massage and few herbal supplements can help u have firm breasts...

It is not easy to correct breast sagging. Moreover you have less time before marriage. Anyhow consult a breast surgeon for solution.

Contact through online to overcome problem by gel     exercise. Diet

Dear Shweta ji , Though the size of breast depends on various factors like genetics , body mass and proportion, fat contents and physical activity etc. and hence It Is multifactorial . Similarly treatment or breast reduction or sagging breast reduction/ tightening also depends on  various factor. Some of Hormonal therapy may be advantageous.besides exercise , There are oils which needs to be massaged on alternate day , and medicine to be taken will quickly tighten the sagging or loose skin . Surgery can be the last option if not improve with medicine . U r running short of time as marriage is planed shortly . Consult me for full  advice and prescription.

Hello Shweta, there can be many possibilities for the problem.. Consult a surgeon for best advice