Bankruptcy may result in your credit score improving, as your successful completion of the case will result in a Discharge of your debts.  That means your creditors will be barred from collecting the balances due on those accounts. 

However, a Bankruptcy filing does not erase your past credit history.  So any default on your obligations, lawsuits filed and Judgments rendered, will be part of your credit reports for a period of up to seven (7) full years.  While the Bankruptcy itself will be noted for a ten (10) year period.