Captcha on lead form php

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Bids
9
Avg Bid (USD)
$20 / hr
Project Budget (USD)
$15 - $25 / hr

Project Description:
hi i need Captcha to be upgraded
Spam is passing through already captcha applied to a php form
also you have to tell me the changes done on file

its a lead form so keep in mind ( no verification page and no access to lead submission form codes)

jquery or ajax needed to implement verification

already captcha is working but some spam still passing

$20 is Max budget
need in less then 1 hour

Hours of work: 1 Hr / week Project Duration: < 1 week Skills required:
Algorithm, HTML, PHP
About the employer:
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$25 / hr
Hours: 40 hr/ week
$22 / hr
Hours: 1 hr/ week
$22 / hr
Hours: 1 hr/ week
$22 / hr
Hours: 1 hr/ week
$20 / hr
Hours: 1 hr/ week
$20 / hr
Hours: 1 hr/ week
$16 / hr
Hours: 20 hr/ week
$18 / hr
Hours: 1 hr/ week
$16 / hr
Hours: 48 hr/ week