Here is an approach to recover your Anchors. The concept can be extended for any number of buttons.
1. Create a box on the page and give it the six anchor Names [N1 N2 N3 N4 N5 N6] - for my example I used One, Two, Three, Four Five, Six.
This is needed to allow you to create the links from your buttons to the anchors.
2. Create a row of six buttons: [B1] [B2] [B3] [B4] [B5] [B6] and link B1 to N1, B2 to N2, etc
3. Clone the button row into the five remaining locations.
4. Add one Anchor to one button on each row:
R1: [N1] [B2] [B3] [B4] [B5] [B6] B1 is Named N1
R2: [B1] [N2] [B3] [B4] [B5] [B6] B2 is Named N2
R3: [B1] [B2] [N3] [B4] [B5] [B6] B3 is Named N3
R4: [B1] [B2] [B3] [N4] [B5] [B6] B4 is Named N4
R5: [B1] [B2] [B3] [B4] [N5] [B6] B5 is Named N5
R6: [B1] [B2] [B3] [B4] [B5] [N6] B6 is Named N6
5. Delete the Box with the six anchors.
If you publish the above, then clicking B3 on R4 will shift the page to R3, etc.
I shifted the anchors onto the buttons so you always have something to click without scrolling.
I also altered the Named button colour to present a necessary visual context.
I personally would add a further Top link to get back to the top of the page to complete the navigation.
The .web here was an Import from your site to orient you better: Courses by Categories.web
The .web is 1.5MB underpinning my previous concern over the size of your graphics...
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