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Hi

It's very common in our (school, college, etc) culture to explain things something like this.

His basics are very weak.

We need to strengthen his basics first. Only then we can work on the current syllabus.

https://www.google.com/search?source=hp&ei=HxrmXbGzIYrBUq26lKgE&q=%22basics+are+weak%22&oq=%22basics+are+weak%22&gs_l=psy-ab.3..33i22i29i30l2.1055.5981..6143...1.0..0.258.3257.0j14j3......0....1..gws-wiz.......0i131j0j0i22i30j0i22i10i30.6ZyIJPvwJmY&ved=0ahUKEwjxvu-ghZnmAhWKoBQKHS0dBUUQ4dUDCAY&uact=5

Could you please tell me how the red parts sound to your native ears? Also, what are the other possible ways to say the same?

Thanks,

Tom

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Could you please tell me how the red parts sound to your native ears? They are OK.

Also, what are the other possible ways to say the same?

We sometimes talk about 'his fundamentals'.

Or say eg 'He doesn't have a good grounding in math'

Comments  
Mr. TomCould you please tell me how the red parts sound to your native ears?

Clear and understandable but not familiar.

Mr. TomAlso, what are the other possible ways to say the same?

You could say that someone doesn't know the basics or they don't know enough of the basics of a subject. There is a difference between the underlined parts which means that which one you use will depend on your particular context.