If you can't remember your index number then go to your high school and let them identify your index number for you. Ask them to write a recommendation letter for you and use the procedure below to apply for replacement.
Procedure of applying for replacement of KCSE certificate: https://kenyayote.com/knec-replacing-kcse-kcpe-lost-certificate-statement/
Your question is not clear. If you have your KCSE certificate then your index number is on your KCSE certificate.
Results slips are irrelevant if you have your KCSE certificate.
All you are needed to do is to login to kuccps portal and select the courses you want then add them to your basket. Here is a complete guide on How to revise kuccps courses.
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