HTML Redirect to WP pages

You could add something like this in your htaccess:

RewriteCond %{QUERY_STRING} ^(.*)$
RewriteRule ^redirect\.html$ /%1 [L,R=301]

EDIT: based on comments, you’ll need some additional conditionals to sort different query strings.

RewriteCond %{REQUEST_URI} ^/redirect.html(.*)$
RewriteCond %{QUERY_STRING} ^p=test$
RewriteRule (.*) /new-test/ [L,R=301]

RewriteCond %{REQUEST_URI} ^/redirect.html(.*)$
RewriteCond %{QUERY_STRING} ^p=pagename$
RewriteRule (.*) /new-page/ [L,R=301]

I also highly recommend this site for testing htaccess: http://htaccess.madewithlove.be/