Most colleges only want your best scores and don't care how many times you take a test. Some colleges also super-score the tests which means they take the highest sub-scores from multiple sittings and create a higher composite score. Ask colleges that you are interested in if they do this.
ACT and College Board both offer free test-prep on their websites if that is something that you feel you want or need.
Remember that the test is just one part of the entire application. Your GPA and the college prep classes you take are more important. There are many colleges that are test-optional and do not require that you send in a test score. Here is a list of those colleges.
Here is a full list of the testing dates for the 2018-2019 school year.
Standardized College
Testing Dates for 2018-2019
Test Date
|
Registration Deadline
|
Late Registration (Extra Fee)
|
September
8, 2018
|
August
10, 2018
|
August
11-26, 2018
|
October
27, 2018
|
September
28, 2018
|
September
29- October 14, 2018
|
December
8, 2018
|
November
2, 2018
|
November
3-19, 2018
|
February
9, 2019
|
January
11, 2019
|
January
12- 18, 2019
|
April
13, 2019
|
March
8, 2019
|
March
9-15, 2019
|
June
8, 2019
|
May
3, 2019
|
May
4-10, 2019
|
July
13, 2019
|
June
14, 2019
|
June
15-14, 2019
|
Test Date
|
Subject Tests Available
|
Registration Deadline
|
Late Registration (Extra fee)
|
August
25, 2018
|
Yes
|
July
27, 2018
|
August
15, 3018
|
October
6, 2018
|
Yes
|
September
7, 2018
|
September
26, 2018
|
November
3, 2018
|
Yes
|
October
5, 2018
|
October
24, 2018
|
December
1, 2018
|
Yes
|
November
2, 2018
|
November
20, 2018
|
March
9, 2019
|
No
|
February
8, 2019
|
February
27, 2019
|
May
4, 2019
|
Yes
|
April
5, 2019
|
April
24, 2019
|
June
1, 2019
|
Yes
|
May
3, 2019
|
May
22, 2019
|