I had trouble too and still have it

. But this book helped me a bit. Gallagher basically gives an approach how to read and outline mpt within the limited time.
http://www.barwrite.com/about_mary.html
Basically her approach is:
Step-1: Read instructions very carefully:
- list the issues (outline them - don't find new issues just stick to the issues asked. Most of us think too much but just stick the issues asked. As someone said just copy the issues verbatim), - understand format they want you to draft (memo, letter, brief etc..).
Step-2: Read law and then facts - mark or outline important portions.
Step-3: Read caselaw and you mark/outline important portions for analysis.
Step-4: read instructions again quickly just so you understand the format they are asking you to draft.
Step-5: hope you have done mini outline by now. All within 45 mins. Stick to the time because it will hurt your writing portion.
Step-6: Follow IRAC or CIRAC. CIRAC is better for MPT. Have an introduction and do write the final conclusion in the beginning para and address each issue separately.
She also suggests a tabular formulae but it's hard to keep up with. But you always can have simple tables like list no of issues, list corresponding law, relevant case laws and facts. Basically an outline in different format. Stick to an outline format that works for you.
Don't worry that you need to write all information. Just address the issue one at a time and write the relevant law, case law, facts and conclude.
Don't worry to write like model mpt answers. That will take us 3 -4 hours n not 90mins

.
Practice atleast 3-4 MPTs b4 exam. 1st one don't worry about time but read and follow CIRAC. Now read model answer see what you missed. 2nd mpt start timing yourself. If you have time, do all past MPTs but guess it's a lot of work. I am sure when you do 3rd mpt ypu will only have energy to outline and check the answer

.
So don't panic you didn't get a grasp of all information. The test is whether you are able to follow their instructions as listed in the memo.