How do I get rid of the bumps in the bck of my tounge?

Normal to have them. It is normal to have bumps in the back of your tongue. They are called circumvallet papilla. They are about 8 to 10 bumps surrounded by moats locate in a v in the back on the tongue. They are part of the taste bids in your tongue. They are normal. They will not go away.
You don't. . The 'bumps'' on the back of your tongue are circumvalate papillae-type of taste bud. The bumps in the dude of the tongue in the back are tonsil tissue (like the 'golf ball' looking things in your throat. All are normal.