Summary
Japan’s English proficiency ranking dropped to 92nd out of 116 countries, the lowest ever recorded.
The decline is attributed to stagnant English proficiency among young people, particularly due to the COVID-19 pandemic.
The Netherlands ranked first, followed by European countries, while the Philippines and Malaysia ranked 22nd and 26th, respectively.
https://en.m.wikipedia.org/wiki/Japanese_phonology
Go to the Consonants section. There are lots of useful notes there, and you can also click on the individual consonants for more information, including how to configure your mouth to make the sound. “ch” and “sh” are tɕ and ɕ, “j” is dʑ at the beginning of utterances or after ん and is ʑ after a vowel, “w” is w.
Compare to English under the Phonemes section. “ch” and “sh” are tʃ and ʃ, “j” is dʒ, “w” is w.