Rotate your hardest subject through your best hours, not whatever's left
Most study plans fail not because the total hours are wrong, but because the hardest subject keeps landing in the leftover, low-energy slots. Once you know when you actually concentrate best, moving your most demanding subject into that window -- instead of your easiest one -- usually produces a bigger score improvement than adding more total hours.
Tighten the blocks as the exam gets closer
Two weeks out, hour-long blocks by subject are usually enough. In the final few days, switching to shorter 20-30 minute blocks focused on your weakest topics and a fast pass through your summary notes tends to be a better use of the remaining time than sticking to the same broad structure you used earlier.
Frequently Asked Questions
How long should one block be?
It depends on the subject and how long you can hold focus, but 30 minutes to an hour is a common range -- long enough to get into a subject, short enough to keep it flexible.
What if I fall behind my planned blocks partway through the day?
That's normal -- use your buffer blocks to absorb the slippage, shift the remaining tasks rather than trying to force the whole day back on schedule, and fold whatever didn't get done into tomorrow's plan.