Recommendations:
Read middle school history and science texts to review your knowledge of the content. Look at the specific standards covered in the MTEL to focus on re-educating yourself on those specific standards. Make sure to take the practice test and determine which areas you require further study.
NOTE: The General Curriculum (03) test was redeveloped and retired August 20, 2023. The redeveloped test has been available since August 21, 2023. Please note that there is no longer a math subtest; there are two subtests that make up the test. One is humanities focused and the other is STEM focused.
Resources:
Book Recommendation: MTEL General Curriculum 78 Prep Book (redeveloped test)
Book Recommendation: MTEL General Curriculum Exam Secrets Study Guide (redeveloped test)
Book Recommendation: Spectrum Science Grade 4
Khan Academy is a great resource for brushing up on all of these topics as well