To understand how many different prospects registered for their most recent webinar, LenoxSoft should review the Unique Submissions metric on the Marketing Cloud Account Engagement form report. This metric shows how many distinct prospects filled out the form, regardless of how many times they submitted it. Total Submissions shows the total number of form submissions, including duplicates. Conversions shows the percentage of form views that resulted in submissions. Total clicks shows the number of times the form was clicked, regardless of whether it was submitted or not

According to the Salesforce documentation, the variable tag that must be included in an email to allow prospects to manage their email preferences is %%unsubscribe%% or %%email_preference_center%%. A variable tag is a placeholder that is replaced with a specific value when the email is sent. The %%unsubscribe%% variable tag is replaced with a link that allows the prospect to unsubscribe from all emails from the sender. The %%email_preference_center%% variable tag is replaced with a link that allows the prospect to opt in or out of specific email lists or categories. Either of these variable tags can be used to enable prospects to manage their email preferences, and they are required by law in some countries. %%opt_out%% or %%email_preference_center%%, %%opt_out%% report_spam%%, and %%unsubscribe%% or %%opt_out%% are not valid variable tags that can be used to allow prospects to manage their email preferences, as they are either incorrect or nonexistent. Reference: Salesforce documentation

The baseline grade will not show on the prospect profile at all times. The baseline grade is the initial grade that Marketing Cloud Account Engagement assigns to all prospects before any adjustments are made based on their attributes. The baseline grade is D by default, but you can change it in your account settings. The baseline grade will only show on the prospect profile if the grade has not changed positively or negatively. Once the grade changes, the baseline grade will be replaced by the current grade. The current grade reflects the prospect's fit for your ideal customer profile based on the criteria you have set. You can view the grade history and the grade changes on the prospect profile. For more details -> 111213

The automation tool that should be used to increase a prospect's score an additional five points every time a specific form is completed is completion action. A completion action is an automated task that is triggered by a certain element in Marketing Cloud Account Engagement, such as a form, a form handler, a custom redirect, a page action, or a file download17. A completion action can perform various actions, such as adjusting score, adding to list, assigning to user, sending autoresponder email, and so on18. A completion action can be added to a form in the fourth step of the form builder tool, and it can be customized to execute only on prospects who meet specific criteria19. A completion action is not retroactive and will only apply to prospects who complete the chosen action moving forward

To view a prospect's Marketing Cloud Account Engagement landing page submission activity on the syncing contact in Salesforce, an Administrator can use the following features:
The Marketing Cloud Account Engagement Activities Visualforce page, which shows a detailed history of the prospect's interactions with Marketing Cloud Account Engagement assets, including landing pages, forms, emails, and custom redirects.
The Salesforce Activities section, which shows the tasks and events that are logged for the contact, including Marketing Cloud Account Engagement landing page submissions. Reference: [Marketing Cloud Account Engagement Activities Visualforce Page], [Salesforce Activities]