Practise the thinking. Keep the judgement.
Choose online study resources for the task in front of you
A short resource-selection checklist for lessons, flashcards and practice questions, with a worked example and a clear stopping point.
Write down the job before choosing a website
A lesson explains a method, a dictionary resolves a word, a card prompts recall, and a practice question tests use. Start with what you need to produce: for example, “solve a ratio question and explain the calculation”. That gives you a reason to choose a resource.
If you cannot yet explain the method, look for a worked example. If you understand it but forget a term, a short recall prompt may be enough. If you need to judge your pace, use practice with conditions that match the part of the exam you are preparing for.
Check fit, source and feedback
Before committing time, ask: Does this cover my subject and level? Who wrote or reviewed it? Can I check the answer and reasoning? Is the version or date relevant? Cornell’s source-evaluation guidance emphasises authority, usefulness and reliability.
For exam rules, go to the exam provider. For independent practice, check what the author claims the material covers. A polished design, a large question total or a high position in a recommendation list does not by itself establish that a resource matches your task.
Try one small task before collecting more
Suppose you are revising ratios. Use one explanation and one original practice question. Read the worked example, close it, solve the question and compare your reasoning. If the feedback only gives a letter, you may need another source to understand a mistake.
Record one line: Resource — Job — What I produced — Keep or replace. A resource earns a place in your routine when it helps you do the work. You do not need several overlapping websites for every stage of the same short task.
Choose a stopping rule
Stop searching once you have a suitable explanation, a way to attempt the task and a way to check it. Save other recommendations for later. Repeatedly comparing tools can take the time you intended to spend learning.
Reconsider the resource when the task changes or when you find a specific gap: missing level coverage, unclear explanations or outdated rules. Your shortlist can change with evidence. It does not need a permanent winner or a claim that one platform is best for everyone.
Try it yourself
You know a formula but keep applying it to the wrong quantity. Should your next resource be a longer definition list or a worked example with a new question?
Show the answer and explanation
Choose a worked example that makes the quantities explicit, followed by a new question you can check.
The gap concerns applying the method. A definition list may help recall the formula, but it does not directly test which quantity belongs in it.