It’s important to make a distinction between the percentage on the stats site and the percentage of items that are considered correct for the SRS. The stats site includes all answers to reviews (the aggregate of the % that shows up while doing reviews in the top right corner). Let’s say you review two kanji. The first kanji you get the meaning and reading correct right away (2/2). For the second kanji, you get the meaning correct right away, but you get the reading wrong once and then get it right (2/3). The stats site would say your percentage is 80% (4/5). But you actually got 50% (1/2) of the items to go up in the SRS.
To give a real example, I just finished a review session of 55 items. Within the review session, my final score was 95%, which is roughly what my overall average is on the stats site. However, according to the summary page, I got 89% correct, which is all the SRS cares about (I would guess this is slightly above my average). My point is, the actual percentage of items that move up in the SRS is always less than the percentage that is shown during a review session and on the stats site. So if someone is getting 70% on the stats site, they are doing worse in the SRS itself, which is a concern.
Sorry for the long-winded post… it got a bit away from me.
P.S. @anon78952551, please don’t be discouraged by this. You are taking the first important step by asking for advice and I hope you take this opportunity to modify your approach to WaniKani (and perhaps studying in general) so that you can learn more effectively.
P.P.S I second @konekush’s suggestion to use the Keisei Semantic-Phonetic Composition script. It will help you learn on’yomi kanji readings by recognizing patterns and this will help you learn the vocab better as well.