Hello Shekhar,

Well if you have a category certificate of your's then you have to show it at the time of counselling in the process of document verification. Like if you fall in PwD category , then you have to show PwD certficate. Below I have provided the complete counselling process for AP EAMCET 2019 - 

• Step 1 : Payment of counselling Fee - The eligible candidates are required to pay the counselling fees. The fees have to be paid through online mode i.e. through credit card/debit card/net banking. The counselling fees is Rs 1200 for OC/BC category & Rs 600 for ST/SC category.
• Step 2 : Verification of Documents - After payment of the ciunselling fees , the candidates needs to visit their respective HCL (Help Line Centres) for document verification. Both original & photocopies of the documents needs to be provided by the candidates. 

        List of documents - 

• AP EAMCET 2019 Rank card
• AP EAMCET Hall Ticket
• Payment Receipt of Counselling fees
• 10th & 12th Mark Sheet
• Pass Certificate
• Migration Certificate
• Adhar Card
• Domicile Certificate
• Disability Certificate (if applicable)
• Category Certificate (if applicable)
• Income Certificate
• NCC/CAP/Sports/Minority Certificate

• Step 3 : Filling Of Choices - The candidates needs to fill their choice of branch & college as per their preference.
• Step 4 : Seat Allotment - The authorities will announce the results of AP EAMCET 2019 on 11th July. A total of three rounds of seat allotment will be conducted. Allotment will be done on the basis of merit,category,reservation,selected preferences & availability of seats.

You can also go through this link and checkout the detailed counselling procedure for AP EAMCET 2019 :  https://engineering.careers360.com/articles/ap-eamcet-counselling

Hope I have answered your query. Good Luck!!!