diff --git a/remix/exp/cond.rkt b/remix/exp/cond.rkt
deleted file mode 100644
index cebb7b4..0000000
--- a/remix/exp/cond.rkt
+++ /dev/null
@@ -1,25 +0,0 @@
-#lang racket/base
-(require (for-syntax racket/base
-                     syntax/parse))
-
-(define-syntax (brackets-cond stx)
-  (syntax-parse stx
-    [(_)
-     (syntax/loc stx
-       (error 'cond "Reach the end of cond"))]
-    [(_ ((~literal #%brackets) q . a) . more)
-     (syntax/loc stx
-       (if q (let () . a) (brackets-cond . more)))]
-    [(_ e . more)
-     (syntax/loc stx
-       (let () e (brackets-cond . more)))]))
-
-(module+ test
-  (brackets-cond
-   (define x 5)
-   (#%brackets (even? x)
-               27)
-   (define y (+ x 6))
-   (#%brackets (odd? y)
-               28)
-   19))
diff --git a/remix/exp/struct.rkt b/remix/exp/struct.rkt
deleted file mode 100644
index ab6b1d9..0000000
--- a/remix/exp/struct.rkt
+++ /dev/null
@@ -1,72 +0,0 @@
-#lang racket/base
-(require racket/unsafe/ops
-         ffi/unsafe)
-
-(define (test-struct N)
-  (struct the (f i r))
-  (define x #f)
-  (define y #f)
-  (define z #f)
-  (for ([i (in-range N)])
-    (define t (the (exact->inexact i) i (number->string i)))
-    (set! x (the-f t))
-    (set! y (the-i t))
-    (set! z (the-r t))))
-
-(define (test-unsafe-struct N)
-  (struct the (f i r))
-  (define x #f)
-  (define y #f)
-  (define z #f)
-  (for ([i (in-range N)])
-    (define t (the (exact->inexact i) i (number->string i)))
-    (set! x (unsafe-struct-ref t 0))
-    (set! y (unsafe-struct-ref t 1))
-    (set! z (unsafe-struct-ref t 2))))
-
-(define (test-unsafe*-struct N)
-  (struct the (f i r))
-  (define x #f)
-  (define y #f)
-  (define z #f)
-  (for ([i (in-range N)])
-    (define t (the (exact->inexact i) i (number->string i)))
-    (set! x (unsafe-struct*-ref t 0))
-    (set! y (unsafe-struct*-ref t 1))
-    (set! z (unsafe-struct*-ref t 2))))
-
-(define (test-vector N)
-  (define x #f)
-  (define y #f)
-  (define z #f)
-  (for ([i (in-range N)])
-    (define t (vector (exact->inexact i) i (number->string i)))
-    (set! x (vector-ref t 0))
-    (set! y (vector-ref t 1))
-    (set! z (vector-ref t 2))))
-
-(define (test-unsafe-vector N)
-  (define x #f)
-  (define y #f)
-  (define z #f)
-  (for ([i (in-range N)])
-    (define t (vector (exact->inexact i) i (number->string i)))
-    (set! x (unsafe-vector-ref t 0))
-    (set! y (unsafe-vector-ref t 1))
-    (set! z (unsafe-vector-ref t 2))))
-
-(define (test-cstruct N)
-  (define-cstruct _the ([f _float] [i _int] [r _racket]))
-  (define x #f)
-  (define y #f)
-  (define z #f)
-  (for ([i (in-range N)])
-    (define t (make-the (exact->inexact i) i (number->string i)))
-    (set! x (the-f t))
-    (set! y (the-i t))
-    (set! z (the-r t))))
-
-(module+ test
-  (for ([p (in-list (list test-struct test-vector test-unsafe-struct test-unsafe*-struct test-unsafe-vector test-cstruct))])
-    (printf "testing ~v\n" p)
-    (time (p 1000000))))
diff --git a/remix/exp/reader.rkt b/remix/tests/reader.rkt
similarity index 100%
rename from remix/exp/reader.rkt
rename to remix/tests/reader.rkt