It's kinda hard to decipher from those results (hard to know if they are accurate.) First TA was 0, now 100 - CYA 0, now 100 - PH 3 (not really possible) and now 7. These are huge moves - so did you add these chemicals or is that just 2 tests?
A little history on the pool might help determine if you are indeed making progress. What's the water quality like, what kind of chems have been added, etc.
IF your CYA is really 100 - you'll want to keep your FC level much higher than 3
IF your PH is really 7 it might be a little low. If you are using bleach to chlorinate you'll probably find it comes up on it's own.