Improve the site on drupal

Improve the site on drupal
1. The taxonomy is damaged (or not done) on the site. Under some circumstances, the content is mixed.
2. One of the forms that send messages fell off. Through "Materials" the form is not found.
3. Bots go through the captcha (for addition) and send messages (through another form).
4. There is a piece integrated with Excel Office-365. Made according to the type of Googledisk. In it, you need to make it possible to bulk download files (download).

In general, you can conduct an audit and see what can be repaired in layout and improved. Also, it can be difficult for me to introduce new materials to the site in the form I want, hopefully this work is also a job for you.