Hello Bhavaya, It's not 5000, there must be some technical fault... Actual fee structure is as above mentioned from official site. I'm sending the link you can apply from there.... Hope that would help you...
https://engineering.careers360.com/articles/kcet-application-form
or
https://cetonline.karnataka.gov.in/ugapplication2018/Home.aspx
KCET 2018 Application Fee
S.No.
Categories
Application Fee
Bank Charges
E-Post Office Charges
1.
General/ OBC
650
Rs. 10
Rs. 12
2.
SC/ ST/ Category 1
500
3.
Candidates qualifying Pre-University and 12th standard from state other than Karnataka
750
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