California bonds won a higher credit rating.

Standard & Poor’s, a leading credit-rating service, upgraded the rating on $7.3 billion in California general obligation bonds to Aa+ from Aa. The new rating is the service’s second-highest rank. S&P; also assigned an Aa+ rating to $240 million in state bonds scheduled to be issued next week. Ratings on 37 state-insured hospital bonds and those of the San Francisco State Building Authority also were raised to Aa+. S&P; cited the state’s improved financial condition, including its projected surplus of $1 billion for fiscal 1985 and diminished pressure from local governments for increased state aid.