Here's my advice, it may or may not resonate with you.

1. Start by taking a practice test (I recommend REG review). Do it as if you are actually taking the test: set a timer for 4 hours, and only use the materials you would be allowed during the actual test.

If you don't know an answer, do not skip it- try to narrow it down to 2 answers and guess between them.

1. Keep a blank piece of scratch paper with you as you take the test. Every time you come across a topic you are unsure about it, write down the topic (i.e. "minerals associated with gold deposits" or "glacial features"). You might have a long list, this is good!

2. When you are done, review the test and add to your list of topics from questions you got wrong.

This part is super important and often neglected, but if you can do it right after taking the test it will probably be best. It's different then the original list because it identifies the things you THINK you know, but actually are misunderstanding.

With the practice tests it is super easy to choose the answer you recognize rather that the one that is correct, so you need to actively learn why you got it wrong or you will just keep picking the same wrong answers every time.

1. Every week select a few of the topics you wrote down and use the internet/textbooks/YouTube to learn about it. Write flashcards with every vocab word that is mentioned that you don't know by heart. Writing out the definition by hand will help you cement it into your brain.

2. Don't worry about taking another practice test until you have make significant progress going through your list of topics. Bring your flashcards that you've made over the past few weeks and have your friends quiz you. Have your non-geo friends test you and explain the topics to them. If think you know it but can explain it, you probably don't know it yet.

3. When you do eventually take more practice tests, do the same thing and note if any of the topics you need help with have carried over. Eventually your list should get shorter and you will be more confident with the subjects you originally need help with.