Parameter and CAPTCHA Accuracy

Hello admin

I want to ask any questions:


1. How to choose the Name in Parameter field (HTTP Post) to use as a filter and to reduce the response time to make a fast process? (see screenshot )






2. How to create a New Category in this field?







3. How to make the captcha answer with an average accuracy rate of 90%, I was tried one night, also google 'Captcha Destruction Kit' then find a lot of information and didn't success ?







4. What is the meaning or what side effect to use of this parameter



Please your help..