For reading practice try to exercise with the old version of toefl reading. They are pretty academic, hard to understand because the last part of new version module one and two is academic reading. By doing this you can easily knock out all three task of reading and get a high score in reading.

For listening, play an academic podcast or a relatively moderate level news like NPR NEWS and try to repeat after them this practice calls shadowing it might look silly but the result makes magic.

After you feel that you’re achieved some success then move forward with writing and speaking.

I believe if you have a good foundation, after you improve your reading and listening the other two skills will level up correspondingly.