Hello aspirant, if you have taken a year drop then you cannot get admission based on GUJCET 2020 exam in 2021. You need to give Gujcet 2021 exam and  based n your rank in 2021 exam you will get admission in government engineering colleges in Gujrat. The application process has started on 23 June and will end on 30 June and the exam is expected to be conducted in 2nd week of August.

For detailed information about GUCET 2021 exam visit - GUJCET Exam 2021 - Registration (Started), Eligibility, Admit Card, Exam Date, Pattern, Syllabus, Results (careers360.com)