Hi aspirant,
The Gujarat Board takes around 40 to 45 days to finish the checking of answer booklets and process the outcome information. The Gujarat HSC Science Result last year was declared on May 10. The students can expect the GSEB 12th Science Result to be announced in the month of May/June.
Lately it is announced that the results are already out since May 10th. Furthermore, you can keep a check on the official page.

Good luck!