How many hours should I study for a science test?

It may be that the battery on your controller has failed. Many repair shops can replace the battery for you. Or, if you are familiar with electronic repair, you can...

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Like most aquatic plants, water lilies need 4-6 hours worth of sun to flourish best.

It takes less than an hour if you use chocolate chips.

In that case, break up the material into topics. Then study them with short breaks in between. Study the most important points in every single topic, accepting that depth isn't...