‘Overwhelming’ is a useful adjective for emphasis. This blog reviews other uses of the prefixes ‘over’ and ‘under’.
Task 2 Essays takeaways
justify
‘Justify’ and ‘justification’ are powerful academic words and therefore excellent to use in formal essays.
guarantee
Using expression to question how much can be guaranteed (e.g. websites that guarantee Band 7) shows critical thinking – see how to use it here.
in case of
‘In case of’ might not have the meaning you think it has – see the issues it causes here.
consideration
‘Consideration needs to be given to’ is such a nice formal expression that you can apply to many different topics.
benefit
There are many useful collocations for ‘benefit’ that will strengthen your arguments. Practise them here.
advent
‘Advent’ means ‘the coming of’, so it’s useful for introducting Task 2 essays e.g. ‘With the advent of the internet…’
People are easy to learn
This is a language interference issue that is easy to fix,

on the contrary vs in contrast
Avoid using ‘on the contrary’ as a linking word – it is only used in very specific circumstances.