a. true
Breaking up study times across several days is more effective than cramming because then you will not have to study everything at a go and you may also retain a lot of information.
In such cases you also get time for revision, which you otherwise don't get of you start cramming up work since everything is now jumbled up in your brain.
When you study shorter information for a short period of time, your brain retains that information and keeps on unconsciously repeating it. But in case you start learning everything together, your brain may not be able to process information and thus will retain lesser.
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