Here are a few tips to improve your TOEFL Writing score-

Keep a standard essay structure in mind – Introduction, Problem Statement, Solution, Benefits of the solution, Drawbacks of the solution, Conclusion.
Dedicate each para to one heading, and understand that they do not necessarily have to be in this order. Write the entire essay first. Don’t listen to the critical side of your brain just now.
Once you’ve finished your first draft, you can always come back and edit.

Get more tips here

The questions in the TOEFL Reading section appear para-wise for each comprehension.
A good way to not feel lost is to read the first para, answer the relative questions, read the second paragraph, answer questions for that one, and so on and so forth.

You can download and use the sample paper at the end of this article

Even though you have to figure out the test set-up on your own, taking the test from the quiet comfort of your home is worth it So, if you have been preparing for the exam and have the needed equipment, room, and a speedy internet connection, go for it But in case you don’t have the proper technical equipment, materials, and testing room, I suggest you wait it out.

For this task, you will have to read a short passage, listen to a 2-minute lecture about the same topic, and write a response to what you read and listened to
You will have 20 minutes to complete this task
Here are a few tips to finish this on time

Sample question-
It is important to improve our skills and knowledge as much as possible. Some people prefer to learn from individuals who have more experience than they do – like teachers and supervisors – instead of learning from peers, like their colleagues and classmates. Do you think this is a good idea? Why or why not?
Get more practice questions here

I think that around 500 words is a good count to have
300 is usually not enough for summarizing the answer to this question

Yes, but if you focus too much on writing, you might miss out on a few things
So I suggest you write points instead of sentences while making notes

The Writing Section of TOEFL takes 50 minutes to complete and comprises of 2 questions-
Independent Writing task, which takes 30 minutes
Integrated Writing task, which takes 20 minutes

Try one of these-

Do you agree or disagree with the following statement? Human activity is making the earth a worse place to live. Use specific reasons and examples to support your answer. Some people like to travel with a companion. Other people prefer to travel alone. Which do you prefer? Use specific reasons and examples to support your choice.

For this task, you will be asked a question on a personal topic or an issue and have 30 minutes to solve it.
Depending on what the question is, you will either have to share a personal experience or give your opinion on the topic.
In case it’s an issue-based topic, you will also have to give reasons and examples that support your opinion.

PTE-
PTE is a three-hour long test.
The main parts of the exam include speaking and writing (together), listening, and reading.
You will also have the option to take a 10-minute break between the reading and listening sections.

During the test, you will encounter 20 different question formats, ranging from multiple-choice questions (MCQs) and essay writing to interpreting and repeating information.

For TOEFL, refer this chart

PTE is less widely accepted
But more fair and easier to prepare for

I think it's a good idea to give a mock test at the end of every week for the section you have studied

I think it's important to make notes
Even if it's minimal
It helps you keep track of the structure

Prepare a standard response structure for each question type.
You can dedicate the first sentence to stating the task, then state your opinion along with supporting arguments, and end with a conclusion.
This way, you’ll have a format in mind, and won’t feel baffled when presented with a question.

You will find practice topics on the ETS website also

As you’re attempting each question, notice the question type. It may be a question asking the purpose behind a certain statement, a sentence insertion question, or a vocabulary testing question. At the end of the test, notice which question type you’re failing to answer, and improve your score accordingly.

You can always buy external speakers, just to be safe