San Jose Unified is a huge area with a number of schools. In general the Almaden area (zip code 95120 mainly) has the best elementary schools: Graystone, Simonds and Williams with API scores in the mid to high 900’s.
Both Bret Harte middle and Leland high schools are also top notch making this area very desirable in terms of long term value for dollar. San Jose Unified includes Guadalupe and Los Alamitos elementary primarily servicing homes in the 95124 and 95120 area codes. Booksin is also in San Jose Unified but as it is geographically separated has its own webpage.