Practice by topic
Ng at nang: the one Filipino rule worth learning properly
Ng and nang are pronounced the same in ordinary speech. That is exactly why they are worth learning: an examiner can test them knowing that your ear will not help you, and a great many people lose these marks having spoken perfectly good Filipino their whole lives.
The good news is that this is not a memory task. The rule is decidable from the printed sentence, which means you can work it out at the desk without having seen the sentence before.
The short version
Ask what the word introduces. If what follows is a thing - the object of the verb, or who something belongs to - the answer is ng. If what follows says how, when, or how much, the answer is nang.
Ng: the thing
Ng marks the object of a verb, or possession. It is followed by a noun or a noun phrase - something you could point at, count, or hand over.
- Nagsumite siya ng ulat. - what was submitted is a report. A thing.
- Tinanggap ng kawani ang papeles. - who received it. The clerk.
Nang: the manner
Nang does adverbial work. It introduces how something was done, and it also links clauses in the sense of "when" or "so that".
- Nagsumite siya nang maaga. - how the submitting happened. Early.
- Sinuri niya ang talaan nang maingat. - carefully. Manner again.
Notice that the two example sentences with nagsumite are otherwise identical. The verb does not decide it. The word after the blank decides it, which is what makes the rule usable under time pressure.
The test to run at the desk
Cover the word and read what comes after it. Can you put "the" or "a" in front of it and have it still make sense in English - a report, the records, an endorsement? Then it is a thing, and the answer is ng. Does it instead answer "how?" - early, carefully, quietly, at once? Then it is manner, and the answer is nang.
This takes about two seconds once it is a habit, and the examination gives you roughly sixty-seven seconds an item.
Practising it properly
The trouble with practising this from a list is that you learn the list. After the third pass you are recalling which sentence was which rather than applying the rule, and the format stops measuring anything.
Our error-recognition practice generates these fresh rather than drawing from a fixed set, so the sentence is new every time and the only way through it is the rule. Each item comes with the reason it is decided the way it is, not just a letter.