Question

The present atmosphere oxygen composition is 21%. What will happen if oxygen level will rise by 30% and what will happen if the level fall below 5%

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Answer 1

first thing is that earth has everything balanced but by chance if it happens then life would not be possible or not sufficient on earth
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Answer 2

Earth Keeps Every thing Balanced and as we had heard that too much of Any thing is dangerous. So as oxygen.One potential detrimental effect would be on lifespans: more oxygen would mean more oxidative stress caused by oxygen radicals in metabolism (Protein oxidative damage is associated with life expectancy of houseflies ). The damage ranges from DNA and cellular damage all the way to central nervous system modifications (Hyperoxia, reactive oxygen species, and hyperventilation: oxygen sensitivity of brain stem neurons ). Oxygen really is a double-edged sword: for all its positives, its also a toxic element; all cells have defences against it, but the degree to which they're geared to higher atmospheric levels is a question mark, although adaptation is very likely, as shown by this study which successfully selected for flies to live in 90% oxygen.
Some organismal groups will experience gigantism. These include terrestrial arthropods - millipedes, centipedes, insects, maybe also spiders, because they use a tracheal system for gas exchange, a system dependent on diffusion. With more oxygen in the atmosphere, the system will be that much more efficient, leading to more growth. This is seen, with some caveats, in both the fossil record and in modern experiments (see: Gigantism in Insects ).
Other groups that may be similarly affected include fusulinid foraminifera or brachiopods (see:
LATE PALEOZOIC FUSULINOIDEAN GIGANTISM DRIVEN BY ATMOSPHERIC HYPEROXIA ).
Last but not least, there will be a large effect on plants, with wildfires becoming much more common, leading to selection for fire adaptations (already present in many plants) and interesting associated ecologies concerning how the plants recover, how the animals recolonise, and how the ecosystem rebounds before the next wildfire. This already exists nowadays in bushlands and dry forest areas, but it'd be interesting to see it on a wider scale.

And if it lowers it will be harder to breath we will have a harder time concentrating and thinking. Many more people would need to be put on Oxygen to survive, many smokers and others with lung and blood issues would likely die before they knew what was wrong. Some of it might depend on what replaces that missing %3.15 if it disappears because of combustion and is replaced by CO2, while not immediately fatal, combined with the lower Oxygen content could be devastating to most animal life. The healthiest would likely be OK, and those living in very green areas, forests, crop fields etc would do better (assuming the sun is out and plants are doing their thing, if it was a large fire that caused it, there might be no sun for a while, so the plants would be sucking up Oxygen too).