IELTS Official App, IELTS Liz and E2 IELTS on YouTube and the official IELTS test paper sets provided by IELTS.
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https://play.google.com/store/apps/details?id=com.opentalk
Use this app to gain confidence for speaking. I have recommended this. Lots of users, all have the aim to improve at speaking.
As for other sections, tell him to immerse himself in an environment where the English used is better. Read articles, short or long, they should be grammatically correct.
Practice at least 4 reading comprehensions everyday. Try to finish them in an hour. There are many online resources.
He will grow in confidence in some time, it will take a while. But as he will answer correctly, he will surely perform better.
I’ve built this FREE (also ad-free) android app where users can exercise their vocabulary for IELTS, toefl, sat and other exams that test for English proficiency in some form. There are almost 750 users now from over 60 countries and the feedback so far has been great! You can check it out here https://play.google.com/store/apps/details?id=com.dishant26201.wordquiz
If you are from India you can try this app called ( leapscholar). ( https://play.google.com/store/apps/details?id=com.knudge.ielts ).they have feature in which you can practice your speaking.and its free app. If its not available in your country then use vpn and set the location to India it will work..
> How to write at a 9 level’ by Ryan Higgins.
Is it any good? The review on Amazon suggests it might have some quality issues.
https://www.amazon.com/IELTS-Task-write-level-Higgins/dp/1451553404
If you have an Android phone, you can try this app.
It has 4000+ IELTS words. It has a very unique idea of learning. It displays a new word and its meaning on your wallpaper, whenever your open or unlock your phone. Thus you learn as you use your phone throughout the day.
https://play.google.com/store/apps/details?id=com.savaratkar.IELTSEnglishLiveWallpaper
It is from Writing for IELTS (Collins English for Exams). After studying 5 chapters I am able to write as above.