This site offers many previous Tanakh Bagrut exams and some other excellent resources to help you to get ready for the Bagrut.
This site offers all you ever wanted to know about personalities in Tanakh.
They offer numerous summaries in various books and chapters in Tanakh. They also offer excellent summaries in Tanakh for non-religious high schools.
You will find various elements in this link that will give you a deeper understanding of different topics in Tanakh (maps, timelines, Tanakh games etc…).
This site offers summaries on many chapters of books in Tanakh that are relevant for the Bagrut.
Here you will find a Tanakh resource center from the AMIT schools. It’s worth it to review their online pamphlets which are based on the mikud for the upcoming summer Bagrut exams.
This site offers comprehensive summaries on almost all books in Tanakh and they offer summaries of topics that will appear on the Bagrut as well.