I’ve often heard that Japanese people are so bad at English:(
Why are Japanese so bad at English then?
Ask any foreign English teacher, and they tell you, “The grammar-translation method doesn’t work.”
But the grammar-translation method actually does work.
Maybe it’s not the fastest method, but it gets the job done.
By graduation, every high school kid knows a couple thousand English words, easily enough to hold a conversation. Give them a vocabulary test and they’d pass it. So why can’t they speak?
Grammar certainly isn’t the reason.
Sure, I am making some crazy ungrammatical sentences and people still be understanding me.
No grammar? Hey, that be no problem.
Shyness? That’s a well worn excuse lol
The things that we should to develop our levels are;
Reinforce the lessons.
These lessons explain grammar and introduces vocabulary.
Japanese kids have tons of words and a smattering of grammar, but no examples of how to use the stuff in action. 
They need reinforcement: real world materials showing the variety of ways in which words are actually used.
There’s no reading program, no opportunities for conversation or presentation, no schedule for watching movies. 
The grammar explanation isn’t the problem.
Japanese people by and large don’t understand that English is not optional, but essential. Everywhere they look, most of words are still in Japanese.
The majority of the people look Japanese.
It’s like the rest of the world doesn’t exist, except on TV.
But it’s not like Japan’s still an island nation that you reach by clipper ship.
With cheap jet travel and the Internet, the distance between nations is gone.
And what’s the future language of the Internet going to be?
Not Japanese, that’s for sure. 
To the extent that the Net is important- in international trade, exchanging medical and scientific knowledge, and disturbing services- English is the language to bank on.
And bank that cash you can, assuming you can communicate.
The language of ranking-in-the-bucks internationally is, for the near future, very much English.
Practice speaking.
What’s easy on paper is hand in real life.
Make opportunities to speak Japanese.
If you can’t capture a real, live Japanese person, one on the internet will probably do.
Use a language exchange app like HelloTalk.
Don’t beat yourself up over your mistakes.
Study politeness levels and correct vocabulary, but when it comes time to speak, forget all of that and just speak.
Do the best you can and people will forgive your mistakes.
Mistakes are Okay!!
The more you speak, the better you’ll get.
Cheers for now 