> Hi, why there is this behaviour?
>
> CL-USER(1): (setq var-test 5)
> 5
> CL-USER2: (let ((var-test 4)) var-test (eval 'var-test))
>
> 4
> 5
> CL-USER(3):
>
> Thank you very much and Best Regards.
>
> Fabrizio.

Don't you mean the following?

(let ((var-test 4))
  (print var-test)
  (eval 'var-test))

The reason is simple.  The first VAR-TEST being printed is the value of
the local variable, which is bound to 4 by the LET.  The second value
being printed (the 5) is what the LET returns and the top-level
read-eval-print loop prints, which is the value of the variable VAR-TEST
in the global environment, which is the value set by the SETQ - namely, 5.

Remember that EVAL evaluates expressions in the global environment
(unless weird things are done to force otherwise).

 -Bob