After respiration,the energy is primarily converted into which form?

What is meant by the statement "aerobic respiration is more efficient"?

One molecule of glucose + $6$ molecules of $O_2$ + $38$ molecules of $ADP$ combine to form $6$ $H_2O$,$6$ $CO_2$,and .........

The net gain of energy from one gram molecule of glucose during aerobic respiration is (in $ATP$)

One mole of glucose on complete oxidation yields how much energy?

$A-$ $A$ total of $10$ $NADH + H^+$ and $2$ $FADH_2$ molecules are formed in aerobic respiration.
$R-$ One $NADH + H^+$ and $1$ $FADH_2$ are helpful in the formation of $3$ and $2$ $ATP$ molecules respectively.