
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the function $f(x)=\frac{a}{2}x^2+(2a-1)x-2lnx$, where $a\in R$.  
$(1)$ Discuss the monotonicity of $f(x)$;  
$(2)$ For $\forall x\in [1,e]$, $\exists b\in [2,+\infty)$ such that $f(x)\geq b$, find the range of real number $a$.

Present the answer in LaTex format: \boxed{Your answer}
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