You won't be able to download your GUJCET result directly using the application number and seat number if you have lost them.

While applying for GUJCET, you might have received a registration number or a roll number in addition to the application number and seat number. These can sometimes be used to access the result. Check your emails or application documents to see if you have one.

Some websites allow searching for results using the candidate's name and father's name. This option might be available on the GUJCET website, but it's not guaranteed.

https://www.careers360.com/exams/gujcet

I hope it helps!