Hi,
Hope you are doing well.
I am a Google Analytic and Google adword certified professional & Google Tag Manager with over 10 years experience.
Track Forms Submission Without Thank You Pages Using GTM and adding Google Adword Conversion Tracking
With AdWords conversion tracking, you can see how effectively your ad clicks lead to valuable customer activity, such as website purchases, phone calls, app downloads, newsletter sign-ups, and more. Depending on the type of conversion you’re tracking, the setup process is different, so the first step in setting up conversion tracking is choosing a conversion source, or where your conversions come from.
Fire AdWords Conversion Tag to measure conversions from SEM campaigns
if you use AdWords in your marketing mix, then you might be interested in tracking conversions this channel generates. Setting up AdWords Conversion Tag is extremely easy and come with a predefined tag.
Track form submissions
On some occassions, you want to track a specific action, such as user registration, but Google Analytics URL based goals are not an option (i.e. you don't have a dedicated Thank you for registration page).
Thanks
Margub