Reddit mentions of Practice Makes Perfect Complete French Grammar (Practice Makes Perfect Series)

I have Complete French Grammar and Easy French Reader. I really like both of them!

https://www.amazon.com/Practice-Perfect-Complete-French-Grammar/dp/007178781X

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https://www.amazon.com/Easy-French-Reader-Premium-Third/dp/0071850171/ref=sr_1_3?keywords=easy+french+reader&qid=1570791367&s=books&sr=1-3

OK I saw this post again and I have more tips:

• Make sure you've finished learning grammar. Grammar books for self-study cover almost all the bases, so you can flip through one, see what's familiar to you, see what you have left to learn... Practice Makes Perfect Complete French Grammar
  
• Find weaknesses in your vocabulary. Pick a topic like "car" or "sandwich" and write down all the related words you know, in English and French. That includes verbs and adjectives! Now use Wikipedia and Google Image Search to translate or confirm all of those words.
  
• Write a lot.
  
• Follow the news, in podcast and written form.
  
• Follow this user's tips for reading I also use an index card to write down words I don't understand but I don't look them up.

I have Essential French Grammar and McGraw Hill's Complete French Grammar. I find them both to be great, but Essential French Grammar is very cheap via Amazon.

Based on your learning to date, you definitely will not have to start over. There are two broad areas you need to focus on, namely vocabulary and grammar. For grammar, I would work through a good workbook. I used this one: https://www.amazon.co.uk/Practice-Perfect-Complete-French-Grammar/dp/007178781X/ref=sr_1_1?s=books&ie=UTF8&qid=1469435513&sr=1-1&keywords=french+grammar but there is plenty of web material available (the University of Texas has some excellent stuff). This will refresh your knowledge and probably teach you some new material. For vocabulary, again there is plenty on the web. I have found Memrise to be useful or you can use Anki. Then you need to focus on the various productive and receptive skills. For spoken French comprehension, I would suggest listening regularly to franceculture.fr where you should be able to find programmes on subjects of interest (you could start with News in Slow French, as star_jazz suggests if this is too fast at first). For spoken French production you could try one of the various language exchange sites and partner up with a native. If you want to start writing French, lang-8.com will get you corrections from native speakers. For reading French there is, of course, no end of resources on the internet including literature and newspapers such as Le Monde.

I had good experience with Practice Makes Perfect series.

Something like this would help

I have this book for Spanish. Instead of doing every single problem and exercise, I tend to sample the questions. If there's 30- I might do 6 or so, and throw those into Anki and move on(unless you genuinely enjoy doing these). Found it to be fairly effective in conjunction with daily reading and using other materials like Assimil.