diff --git a/js/tests/mapper_test.js b/js/tests/mapper_test.js
index 591d27da..2392ef5e 100644
--- a/js/tests/mapper_test.js
+++ b/js/tests/mapper_test.js
@@ -24,18 +24,18 @@ const arrayFormatSentence = (item, index, arr) => {
 
 // map
 t(({ eq, ctx }) =>
-  eq(map(ctx.numbers, add1), [11, -9, 21, -94, 87, 103, 36, 90, 111]),
+  eq(map(ctx.numbers, add1), [11, -9, 21, -94, 87, 103, 36, 90, 111])
 )
 t(({ eq, ctx }) =>
-  eq(map(ctx.numbers, mult2), [20, -20, 40, -190, 172, 204, 70, 178, 220]),
+  eq(map(ctx.numbers, mult2), [20, -20, 40, -190, 172, 204, 70, 178, 220])
 )
 
 t(({ eq, ctx }) =>
-  eq(map(ctx.numbers, sub3), [7, -13, 17, -98, 83, 99, 32, 86, 107]),
+  eq(map(ctx.numbers, sub3), [7, -13, 17, -98, 83, 99, 32, 86, 107])
 )
 
 t(({ eq, ctx }) =>
-  eq(map(ctx.numbers, doAll), [19, -21, 39, -191, 171, 203, 69, 177, 219]),
+  eq(map(ctx.numbers, doAll), [19, -21, 39, -191, 171, 203, 69, 177, 219])
 )
 
 t(({ eq, ctx }) =>
@@ -49,7 +49,7 @@ t(({ eq, ctx }) =>
     '6: 35',
     '7: 89',
     '8: 110',
-  ]),
+  ])
 )
 
 t(({ eq, ctx }) =>
@@ -63,53 +63,53 @@ t(({ eq, ctx }) =>
     '35 is at index: 6 out of 8',
     '89 is at index: 7 out of 8',
     '110 is at index: 8 out of 8',
-  ]),
+  ])
 )
 
 t(({ eq, ctx }) =>
   eq(
     map(ctx.sentences[0], arrayFormatSentence).join(''),
-    'Colombia, Mexico, and El Salvador are 3 Spanish speaking countries.',
-  ),
+    'Colombia, Mexico, and El Salvador are 3 Spanish speaking countries.'
+  )
 )
 
 t(({ eq, ctx }) =>
   eq(
     map(ctx.sentences[1], arrayFormatSentence).join(''),
-    'Perou, Brazil, Argentina, and Venezuela are 4 countries in South America.',
-  ),
+    'Perou, Brazil, Argentina, and Venezuela are 4 countries in South America.'
+  )
 )
 
 t(({ eq, ctx }) =>
   eq(
     map(ctx.sentences[2], arrayFormatSentence).join(''),
-    'France, Portugal, and Italy are 3 members of the EU.',
-  ),
+    'France, Portugal, and Italy are 3 members of the EU.'
+  )
 )
 
-t(({ eq, ctx }) =>
+t(({ eq }) =>
   // map should not flat
   eq(
-    map([1, 2, 3], n => [n, n]),
+    map([1, 2, 3], (n) => [n, n]),
     [
       [1, 1],
       [2, 2],
       [3, 3],
-    ],
-  ),
+    ]
+  )
 )
 
 // flatMap
-t(({ eq, ctx }) =>
+t(({ eq }) =>
   // flatMap should flatten the result of map
   eq(
-    flatMap([1, 2, 3], n => [n, n]),
-    [1, 1, 2, 2, 3, 3],
-  ),
+    flatMap([1, 2, 3], (n) => [n, n]),
+    [1, 1, 2, 2, 3, 3]
+  )
 )
 
 t(({ eq, ctx }) =>
-  eq(flatMap(ctx.mixed, add1), ['101', -9, 21, -94, 87, '1021', '35,891', 111]),
+  eq(flatMap(ctx.mixed, add1), ['101', -9, 21, -94, 87, '1021', '35,891', 111])
 )
 
 t(({ eq, ctx }) =>
@@ -122,7 +122,7 @@ t(({ eq, ctx }) =>
     '5: 102',
     undefined,
     '7: 110',
-  ]),
+  ])
 )
 
 t(({ eq, ctx }) =>
@@ -135,7 +135,7 @@ t(({ eq, ctx }) =>
     '-33 is at index: 5 out of 7',
     '-4 is at index: 6 out of 7',
     '18 is at index: 7 out of 7',
-  ]),
+  ])
 )
 
 Object.freeze(tests)
diff --git a/subjects/currify/README.md b/subjects/currify/README.md
index 23a9f27c..505d66e0 100644
--- a/subjects/currify/README.md
+++ b/subjects/currify/README.md
@@ -5,9 +5,10 @@
 Create the function `currify` that will curry any functions put as argument.
 
 example:
+
 ```js
 const mult2 = (el1,el2) => el1 * el2
-console.log(mult2(2,2)) // result epected 4
+console.log(mult2(2,2)) // result expected 4
 
 
 const mult2Curried = currify(mult2)
diff --git a/subjects/go-reloaded/README.md b/subjects/go-reloaded/README.md
index dce835cc..0a6c49b6 100644
--- a/subjects/go-reloaded/README.md
+++ b/subjects/go-reloaded/README.md
@@ -643,19 +643,19 @@ student@ubuntu:~/[[ROOT]]/test$
 
 ### Instructions
 
-Write a program that has the same behaviour as the system's `cat` command-line.
+Write a program that behaves like a simplified `cat` command.
 
 - The `options` do not have to be handled.
 
-- If the program is called without arguments it should take the `input` and print it back (as shown with the "Hello" example below).
+- If the program is called without arguments it should take the standard input (stdin) and print it back on the standard output (stdout).
 
 - In the program folder create two files named `quest8.txt` and `quest8T.txt`.
 
-- Copy to the `quest8.txt` file the following sentence :
+- Copy to the `quest8.txt` file the following sentence, with a new line ate the end of the file :
 
 `"Programming is a skill best acquired by practice and example rather than from books" by Alan Turing`
 
-- Copy to the `quest8T.txt` file the following sentence :
+- Copy to the `quest8T.txt` file the following sentence, with a new line ate the end of the file :
 
 `"Alan Mathison Turing was an English mathematician, computer scientist, logician, cryptanalyst. Turing was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer. Turing is widely considered to be the father of theoretical computer science and artificial intelligence."`
 
@@ -666,7 +666,7 @@ Write a program that has the same behaviour as the system's `cat` command-line.
 ```console
 student@ubuntu:~/[[ROOT]]/cat$ go build
 student@ubuntu:~/[[ROOT]]/cat$ ./cat abc
-open abc: no such file or directory
+ERROR: abc: No such file or directory
 student@ubuntu:~/[[ROOT]]/cat$ ./cat quest8.txt
 "Programming is a skill best acquired by pratice and example rather than from books" by Alan Turing
 student@ubuntu:~/[[ROOT]]/cat$ ./cat
@@ -853,8 +853,6 @@ student@ubuntu:~/[[ROOT]]/test$
 
 Write a function `SortedListMerge` that merges two lists `n1` and `n2` in ascending order.
 
-- During the tests `n1` and `n2` will already be initially sorted.
-
 ### Expected function and structure
 
 ```go
diff --git a/subjects/go-reloaded/audit/README.md b/subjects/go-reloaded/audit/README.md
index f10a5e1d..eb82ea09 100644
--- a/subjects/go-reloaded/audit/README.md
+++ b/subjects/go-reloaded/audit/README.md
@@ -576,7 +576,7 @@ slice = [1 2 3 A B C a b c] and f = func(a, b string) int {
 
 ###### Does the program displays the content of the file in order?
 
-##### Run the program with a diferent file and then run the system program `cat` with the same file.
+##### Run the program with a different file and then run the system program `cat` with the same file.
 
 ###### Are the outputs identical?
 
diff --git a/subjects/mapper/README.md b/subjects/mapper/README.md
index 7e763fee..261e8425 100644
--- a/subjects/mapper/README.md
+++ b/subjects/mapper/README.md
@@ -8,13 +8,11 @@ and that works like the method .map
 - Create a `flatMap` function that takes an array as first argument, a function as second,
 and that works like the method .flatMap
 
-
 ### Notions
 
 - [devdocs.io/javascript/global_objects/array/map](https://devdocs.io/javascript/global_objects/array/map)
 - [devdocs.io/javascript/global_objects/array/flatmap](https://devdocs.io/javascript/global_objects/array/flatmap)
 
-
 ### Code provided
 
 > all code provided will be added to your solution and doesn't need to be submited.
diff --git a/subjects/tetris-optimizer/README.md b/subjects/tetris-optimizer/README.md
index 30f1709b..2d0ffe56 100644
--- a/subjects/tetris-optimizer/README.md
+++ b/subjects/tetris-optimizer/README.md
@@ -21,6 +21,11 @@ The program must :
 - The code must respect the [**good practices**](https://public.01-edu.org/subjects/good-practices.en).
 - It is recommended that the code should present a **test file**.
 
+This project will help you learn about:
+
+- The use of algorithms
+- Reading from files
+
 #### Example of a text File
 
 ```console